(svn r7590) -Codechange: (r7585)
- use existing struct Rect instead of declaring new StationRect
- use inline functions instead of macros

(svn r7565) -Codechange: Rework DEBUG functionality. Look for appropiate debugging levels to
use in debug.h. grfmsg() is now used as a specific debug-function for grf.

(svn r7331) - Codechange: Rename all memory pool macro's and types to "old pool", so the new pool implementation can be committed alongside it.
- Codechange: Rename pool.[ch] to oldpool.[ch].

(svn r7195) -Feature: [FS#297, optional elrails] New patches/vehicles option 'disable electrified railways'.
(original patch by maedhros, ideas: peter1138, Darkvater, Rubidium, Patrick, Eddi|zuHause, ..)

(svn r6776) -Codechange: Use IsValidPlayer() function to determine of a PlayerID is an
actual playable player (< MAX_PLAYERS) or not.

(svn r6774) -Codechange: Rename the badly named OWNER_SPECTATOR to PLAYER_SPECTATOR and
put it into player.h where it belongs (instead of map.h)

(svn r6513) -Codechange: unified the code to draw depot windows
This change is intended to make it easier to make depot behaviour consistent
and faster to code when adding more features in the future
The user interface should hopefully not be affected by this

(svn r6406) -Codechange: Rename TileOffsByDir to TileOffsByDiagDir because it accepts
DiagDirections, and add TileOffsByDir that handles Directions.
-Codechange: Make the treeloop use TileOffsByDir().

(svn r6381) -Cleanup: make the '/* */' comments that span multiple lines more uniform.
-Cleanup: whitespace alignment of a few tables.

(svn r6355) -Fix: Go to hangar orders for aircraft could get spuriously removed when a road or rail depot got deleted (Darkvater and me)
This bug is probably ages old

(svn r6353) -Codechange: Make DestinationID a typedef of uin16, which is as large as any type of destinataion (StationID, DepotID, WaypointID) it can hold
DestinationID being a union of these types is just hassle without benefit and cannot be handled correctly everywhere because of local lack of information

(svn r6151) -Codechange: DeleteStation/DeleteRoadStop removes a station/RoadStop from the pool
-Codechange: DestroyStation/DestroyRoadStop is called by DeleteStation/DeleteRoadStop to remove all things where a station/RoadStop depends on.
Last 2 changes to prepare for new pool system. Not pretty now, will be soon.

(svn r6142) -Codechange: added WaypointID (sorry DV, couldn't splits it anymore)
-Codechange: introduced DestinationID, which is in fact an union of several types
Used in Order struct, so no longer StationID is abused for all targets.
Hangars are a big exception, as they use a station-id with GOTO_DEPOT (go figure)

(svn r6055) -Codechange: added GetXXXArraySize, which returns HighestID + 1 (or, will do that).
It isn't the best name, but we couldn't find any better.
This unifies the pool-system even more.

(svn r6053) -Codechange: renamed all IsXXXIndex to IsValidXXXID
-Codechange: IsValidXXXID now also checks if XXX is really valid, not if the number is within range
Both changes again in preperation of the new mem-pool system, which requires this.
IsValidXXXID is not a bit less pretty, but that will be cleaned up after the new mem-pool system

(svn r6052) -Codechange: change OrderType (order->type) in a typedef
-Codechange: renamed DeleteDestinationFromVehicleOrder to RemoveOrderFromAllVehicles to reflect his function better
-Codechange: changed the params of RemoveOrderFromAllVehicles, to avoid unneeded variable-creation

(svn r6049) -Codechange: forgot EngineRenew in r6047
-Codechange: cleaned up the EngineRenew code a bit (coding style mostly)
-Codechange: forgot the correct comment in station_cmd
-Codechange: move pool-stuff to engine.h, like we always do

(svn r6047) -Codechange: FOR_ALL now _only_ loops valid items, and skips invalid ones
-Codechange: use IsValidXXX where ever possible
Note: both changes to prepare for new pool system, which needs those changes.
For every pool there are 2 ugly lines, which will be removed when done
implementing new pool system.
Based on FS#13 by blathijs, partly implemented.

(svn r5999) -Feature: change the original date format to a 32 bits format based at the year 0.
The game date subsystem now allows someone to start in the year 0 and continue
up to the year 5 000 000. However, you currently cannot build anything before
1920 as there is no newgrf support for dates before 1920 or after 2090 yet.

(svn r5887) -Cleanup: move date related functions, defines and variables to date.[ch]
-Cleanup: fix whitespace related coding style issues in date.[ch]
-Cleanup: make original comments doxygen compatible and remove/change outdated comments

(svn r5346) - Feature: Add 4 new airports. 2 for aircraft, 2 for helicopters.
Commuter airport: Small. 5x4. 3 terminals, 2 helipads.
Intercontinental: massive. 9x11. 8 terminals, 2 helipads, 4 runways.
Helidepot: a small heliport with a depot for helis only.
Helistation: a large heliport with 3 helipads and a depot.

(svn r5070) Merged the bridge branch
-Feature: Bridges can now be placed above:
Any railway track combination (excluding depots and waypoints)
Any road combination (excluding depots)
Clear tiles (duh), including fields
Tunnel entrances
Bridge heads

Thanks to Tron for idea and implementation, KUDr for the yapf synchronization and many others for hours of testing

There are still a number of visual problems remaining, especially when electric railways are on or under the bridge.
DO NOT REPORT THOSE BUGS FOR THE TIME BEING please.

(svn r4640) - Add: IsValidDiagDirection, IsValidDirection and IsValidAxis functions.
- Codechange: Use IsValidDiagDirection() in CmdBuildRoadStop().

(svn r4619) -Codechange: Rename FindRoadStationSpot into FindRoadStopSpot and try to document it a little.
if anyone comes up with an idea on how to simplify this thing a bit, I'd be grateful

(svn r4593) CodeChange : Renamed spec (when using StationSpec) to statspec.
This is following the same scheme as for IndustrySpec

(svn r4572) Remove vehicle_leave_tile_proc
There's exactly one implemented function (unbarring a level crossing) and one place where it can be triggered (a train leaves a level crossing)
It's a bit overkill, so just handle this one case where it can happen

(svn r4473) - Newstations:
- Alter parameters of CMD_BUILD_RAILROAD_STATION to accept a custom station class and id.
- Add a dynamically allocated list of custom stations that the SpecIndex (m4) references.

(svn r4466) -Fix: (FS#71) Game no longer crashes when the last vehicle serving a station has been deleted.
-Negative side effect: upon loading old games, stations whose last vehicle was a station have (temporarily) lower ratings.
-Positive side effect: station.h no longer includes vehicle.h (breaks the station.h->vehicle.h->rail.h chain)

(svn r4460) - Newstations: remove unused class_id / stat_id variables from the
Station struct.

(svn r4425) Fix bug introduced in r4411 : while IS_BYTE_INSIDE, max value is STRICKLY LESS THEN. This caused airports animations to stay unanimated. Industries were similarly affected.
Thanks to Richk67 for finding it.
Also, more Gfx define and use.

(svn r4411) CodeChange : Define and use some Gfx for both stations and industries. More are still to come
Also, a bit of code cleaning, as pointed by Tron

(svn r4342) Change the first two parameters of commands - virtual pixel coordinates of the tile to operate on - to a TileIndex
Remove DoCommandByTile(), because now it does the same as DoCommand()