(svn r1751) - Feature: New PathFinder (NPF).

- Supports trains, road vehicles and ships.
	- Uses A* pathfinding (same codebase as the new ai).
	- Currently unlimited search depth, so might perform badly on large maps/networks (especially ships).
	- Will always find a route if there is one.
	- Allows custom penalties for obstacles to be set in openttd.cfg (npf_ values).
	- With NPF enabled, ships can have orders that are very far apart. Be careful, this will break (ships get lost) when the old pathfinder is used again.
- Feature: Disabling 90 degree turns for trains and ships.
	- Requires NPF to be enabled.
	- Ships and trains can no longer make weird 90 degree turns on tile borders.
- Codechange: Removed table/directions.h.
	- table/directions.h contained ugly static tables but was included more than once. The tables, along with a few new ones are in npf.[ch] now. Better suggestions for a location?
- Fix: Binary heap in queue.c did not allocate enough space, resulting in a segfault.
- Codechange: Rewritten FindFirstBit2x64, added KillFirstBit2x64.
- Codechange: Introduced constant INVALID_TILE, to replace the usage of 0 as an invalid tile. Also replaces TILE_WRAPPED.
- Codechange: Moved TileAddWrap() to map.[ch] 
- Add TileIndexDiffCByDir(), TileIndexDiffCByDir(). 
- Codechange: Moved IsTrainStationTile() to station.h
- Add: IsRoadStationTile() and GetRoadStationDir().

order_cmd.c

@@ -136,9 +136,11 @@ int32 CmdInsertOrder(int x, int y, uint32 flags, uint32 veh_sel, uint32 packed_o
 	if (v->num_orders >= 40)
 		return_cmd_error(STR_8832_TOO_MANY_ORDERS);
 
-	/* For ships, make sure that the station is not too far away from the previous destination. */
+	/* For ships, make sure that the station is not too far away from the
+	 * previous destination, for human players with new pathfinding disabled */
 	if (v->type == VEH_Ship && IS_HUMAN_PLAYER(v->owner) &&
-		sel != 0 && GetVehicleOrder(v, sel - 1)->type == OT_GOTO_STATION) {
+		sel != 0 && GetVehicleOrder(v, sel - 1)->type == OT_GOTO_STATION
+		&& !_patches.new_pathfinding_all) {
 
 		int dist = DistanceManhattan(
 			GetStation(GetVehicleOrder(v, sel - 1)->station)->xy,