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+/* $Id$ */
+
+/*
+ * This file is part of OpenTTD.
+ * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
+ * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/**
+ * @file ai_changelog.hpp Lists all changes / additions to the API.
+ *
+ * Only new / renamed / deleted api functions will be listed here. A list of
+ * bug fixes can be found in the normal changelog. Note that removed API
+ * functions may still be available if you return an older API version
+ * in GetAPIVersion() in info.nut.
+ *
+ * \b 1.2.0
+ *
+ * 1.2.0 is not yet released. The following changes are not set in stone yet.
+ *
+ * API additions:
+ *
+ * \li AICargo::CT_AUTO_REFIT
+ * \li AICargo::CT_NO_REFIT
+ * \li AICargo::IsValidTownEffect
+ * \li AICargoList_StationAccepting
+ * \li AICompany::GetQuarterlyIncome
+ * \li AICompany::GetQuarterlyExpenses
+ * \li AICompany::GetQuarterlyCargoDelivered
+ * \li AICompany::GetQuarterlyPerformanceRating
+ * \li AICompany::GetQuarterlyCompanyValue
+ * \li AIController::GetOpsTillSuspend
+ * \li AIInfo::CONFIG_DEVELOPER
+ * \li AIOrder::GetOrderRefit
+ * \li AIOrder::IsRefitOrder
+ * \li AIOrder::SetOrderRefit
+ * \li AITown::GetCargoGoal
+ * \li AITown::GetGrowthRate
+ * \li AITown::GetLastMonthReceived
+ * \li AITown::GetTownAuthority
+ * \li AITownEffectList (to walk over all available town effects)
+ * \li AIVehicle::ERR_VEHICLE_TOO_LONG in case vehicle length limit is reached
+ *
+ * API renames:
+ * \li AITown::GetLastMonthTransported to AITown::GetLastMonthSupplied to better
+ *     reflect what it does.
+ * \li AIInfo has all its configure settings renamed from AICONFIG to just CONFIG
+ *     like CONFIG_RANDOM.
+ *
+ * API removals:
+ * \li AICompany::GetCompanyValue, use AICompany::GetQuarterlyCompanyValue instead.
+ *
+ * Other changes:
+ * \li AITown::GetLastMonthProduction no longer has prerequisites based on town
+ *     effects.
+ * \li AITown::GetLastMonthTransported no longer has prerequisites based on
+ *     town effects.
+ * \li AITown::GetLastMonthTransportedPercentage no longer has prerequisites
+ *     based on town effects.
+ *
+ * \b 1.1.2
+ *
+ * No changes
+ *
+ * \b 1.1.1
+ *
+ * No changes
+ *
+ * \b 1.1.0
+ *
+ * API additions:
+ * \li IsEnd for all lists.
+ * \li AIEventTownFounded
+ * \li AIIndustry::GetIndustryID
+ * \li AIIndustryType::INDUSTRYTYPE_TOWN
+ * \li AIIndustryType::INDUSTRYTYPE_UNKNOWN
+ * \li AIOrder::IsVoidOrder
+ * \li AIRail::GetName
+ * \li AITown::IsCity
+ *
+ * API removals:
+ * \li HasNext for all lists.
+ * \li AIAbstractList, use AIList instead.
+ * \li AIList::ChangeItem, use AIList::SetValue instead.
+ * \li AIRail::ERR_NONUNIFORM_STATIONS_DISABLED, that error is never returned anymore.
+ *
+ * Other changes:
+ * \li AIEngine::GetMaxTractiveEffort can be used for road vehicles.
+ * \li AIEngine::GetPower can be used for road vehicles.
+ * \li AIEngine::GetWeight can be used for road vehicles.
+ * \li AIIndustry::IsCargoAccepted now returns CargoAcceptState instead of a boolean.
+ * \li AIOrder::GetOrderFlags returns AIOrder::AIOF_INVALID for void orders as well.
+ * \li AIRoad::BuildDriveThroughRoadStation now allows overbuilding.
+ * \li AIRoad::BuildRoadStation now allows overbuilding.
+ *
+ * \b 1.0.5
+ *
+ * No changes
+ *
+ * \b 1.0.4
+ *
+ * No changes
+ *
+ * \b 1.0.3
+ *
+ * API additions:
+ * \li AIRail::ERR_RAILTYPE_DISALLOWS_CROSSING
+ *
+ * \b 1.0.2
+ *
+ * Other changes:
+ * \li AIBridge::GetPrice now returns the price of the bridge without the cost for the rail or road.
+ *
+ * \b 1.0.1
+ *
+ * API additions:
+ * \li AIRail::GetMaxSpeed
+ *
+ * \b 1.0.0
+ *
+ * API additions:
+ * \li AIBaseStation
+ * \li AIEngine::IsBuildable
+ * \li AIEventCompanyAskMerger
+ * \li AIIndustry::GetLastMonthTransportedPercentage
+ * \li AIInfo::AICONFIG_INGAME
+ * \li AIMarine::GetBuildCost
+ * \li AIOrder::AIOF_GOTO_NEAREST_DEPOT
+ * \li AIOrder::GetStopLocation
+ * \li AIOrder::SetStopLocation
+ * \li AIRail::RemoveRailStationTileRectangle
+ * \li AIRail::RemoveRailWaypointTileRectangle
+ * \li AIRail::GetBuildCost
+ * \li AIRoad::GetBuildCost
+ * \li AISubsidy::SubsidyParticipantType
+ * \li AISubsidy::GetSourceType
+ * \li AISubsidy::GetSourceIndex
+ * \li AISubsidy::GetDestinationType
+ * \li AISubsidy::GetDestinationIndex
+ * \li AITile::GetBuildCost
+ * \li AITown::GetLastMonthTransportedPercentage
+ * \li AIVehicleList_Depot
+ * \li AIWaypoint::WaypointType
+ * \li AIWaypoint::HasWaypointType
+ * \li Some error messages to AIWaypoint
+ *
+ * API removals:
+ * \li AIOrder::ChangeOrder, use AIOrder::SetOrderFlags instead
+ * \li AIRail::RemoveRailStationTileRect, use AIRail::RemoveRailStationTileRectangle instead
+ * \li AIRail::RemoveRailWaypoint, use AIRail::RemoveRailWaypointTileRectangle instead
+ * \li AISign::GetMaxSignID, use AISignList instead
+ * \li AIStation::ERR_STATION_TOO_LARGE, use AIError::ERR_STATION_TOO_SPREAD_OUT instead
+ * \li AISubsidy::SourceIsTown, use AISubsidy::GetSourceType instead
+ * \li AISubsidy::GetSource, use AISubsidy::GetSourceIndex instead
+ * \li AISubsidy::DestinationIsTown, use AISubsidy::GetDestinationType instead
+ * \li AISubsidy::GetDestination, use AISubsidy::GetDestinationIndex instead
+ * \li AITile::GetHeight, use AITile::GetMinHeight/GetMaxHeight/GetCornerHeight instead
+ * \li AITown::GetMaxProduction, use AITown::GetLastMonthProduction instead
+ * \li AIVehicle::SkipToVehicleOrder, use AIOrder::SkipToOrder instead
+ * \li AIWaypoint::WAYPOINT_INVALID, use AIBaseStation::STATION_INVALID instead
+ *
+ * Other changes:
+ * \li The GetName / SetName / GetLocation functions were moved from AIStation
+ *     and AIWaypoint to AIBaseStation, but you can still use AIStation.GetName
+ *     as before
+ * \li The GetConstructionDate function was moved from AIStation to
+ *     AIBaseStation, but can still be used as AIStation.GetConstructionDate
+ * \li WaypointID was replaced by StationID. All WaypointIDs from previous
+ *     savegames are invalid. Use STATION_INVALID instead of WAYPOINT_INVALID
+ * \li AIWaypointList constructor now needs a WaypointType similiar to AIStationList,
+ *     it can also handle buoys.
+ * \li AIVehicleList_Station now also works for waypoints
+ * \li Stations can be build over rail without signals that is in the right
+ *     direction for the to-be built station. It will also convert the rail if
+ *     the station's rail type supports the old type.
+ * \li GetAPIVersion() was added as function to info.nut. If it does not exist
+ *     API version 0.7 is assumed. This function should return the major and
+ *     minor number of the stable version of the API the AI is written against.
+ *     For 0.7.2 that would be 0.7, for 1.1.3 it would be 1.1, etc.
+ * \li The subsidy logic has changed. Subsidy is now awarded when cargo
+ *     originating from subsidy source is delivered to station that has subsidy
+ *     destination it its catchment area. One industry tile or one town house
+ *     is enough as long as station accepts the cargo. Awarded subsidies are no
+ *     longer bound to stations used for first delivery, any station can be
+ *     used for loading and unloading as long as cargo is transfered from
+ *     source to destination.
+ * \li Make AIEngine:CanRefitCargo() not report refittability to mail by
+ *     default for aircraft. It is not necessarily true. This means that even
+ *     if the aircraft can carry mail (as secondary cargo) it does not return
+ *     true if the aircraft cannot carry it as its only cargo.
+ * \li Improve behaviour of AIEngine::GetCargoType(), AIEventEnginePreview::GetCargoType()
+ *     and AIEngine::CanRefitCargo() for articulated vehicles. For
+ *     CanRefitCargo true is returned if at least one part can be refitted.
+ *     For GetCargoType the first most used cargo type is returned.
+ * \li AIIndustryType::GetConstructionCost() now returns -1 if the industry is
+ *     neither buildable nor prospectable.
+ * \li AIEngine::IsValidEngine will now return true if you have at least one
+ *     vehicle of that type in your company, regardless if it's still buildable
+ *     or not. AIEngine::IsBuildable returns only true when you can actually
+ *     build an engine.
+ * \li AITile::GetCargoProduction will now return the number of producers,
+ *     including houses instead the number of producing tiles. This means that
+ *     also industries that do not have a tile within the radius, but where
+ *     the search bounding box and the industry's bounding box intersect, are
+ *     counted. Previously these industries (and their cargos), although they
+ *     produced cargo for a station at the given location, were not returned.
+ * \li AIRail::BuildRail will now fail completely if there is an obstacle
+ *     between the begin and end, instead of building up to the obstacle and
+ *     returning that everything went okay.
+ * \li Orders for buoys are now waypoint orders, i.e. instead of using the
+ *     station orders for buoys one has to use waypoint orders.
+ * \li Autoreplaces can now also be set for the default group via AIGroup.
+ *
+ * \b 0.7.5
+ *
+ * No changes
+ *
+ * \b 0.7.4
+ *
+ * No changes
+ *
+ * \b 0.7.3
+ *
+ * API additions:
+ * \li AIAbstractList::SORT_ASCENDING
+ * \li AIAbstractList::SORT_DESCENDING
+ * \li AIAirport::IsAirportInformationAvailable
+ * \li AICompany::GetPresidentGender
+ * \li AICompany::SetPresidentGender
+ * \li AIEngine::GetDesignDate
+ * \li AIStation::GetConstructionDate
+ *
+ * Other changes:
+ * \li AIs are now killed when they execute a DoCommand or Sleep at a time
+ *     they are not allowed to do so.
+ * \li When the API requests a string as parameter you can give every squirrel
+ *     type and it will be converted to a string
+ * \li AIs can create subclasses of API classes and use API constants as part
+ *     of their own constants
+ *
+ * \b 0.7.2
+ *
+ * API additions:
+ * \li AIVehicle::GetReliability
+ *
+ * Other changes:
+ * \li DoCommands and sleeps in call, acall, pcall and valuators are disallowed
+ *
+ * \b 0.7.1
+ *
+ * API additions:
+ * \li AIAirport::GetPrice
+ * \li AIController::GetVersion
+ * \li AIOrder::AIOF_DEPOT_FLAGS
+ * \li AIOrder::AIOF_STOP_IN_DEPOT
+ * \li AIOrder::IsCurrentOrderPartOfOrderList
+ * \li AIOrder::IsGotoDepotOrder
+ * \li AIOrder::IsGotoStationOrder
+ * \li AIOrder::IsGotoWaypointOrder
+ * \li AISignList
+ * \li AITile::CORNER_[WSEN]
+ * \li AITile::ERR_AREA_ALREADY_FLAT
+ * \li AITile::ERR_EXCAVATION_WOULD_DAMAGE
+ * \li AITile::GetCornerHeight
+ * \li AITile::GetMaxHeight
+ * \li AITile::GetMinHeight
+ * \li AIVehicle::SendVehicleToDepotForServicing
+ *
+ * Other changes:
+ * \li GetURL() was added as optional function to info.nut
+ * \li UseAsRandomAI() was added as optional function to info.nut
+ * \li A limit was introduced on the time the AI spends in the constructor and Load function
+ *
+ * \b 0.7.0
+ * \li First stable release with the NoAI framework.
+ */