(svn r3155) -Feature: [autoreplace] autoreplace can now remove cars from too long trains

-Trains will now remember the length of stations it visits and sell cars
        when being autoreplaced if they became too long
        -If it needs to remove cars, then it starts from the front and sells
        all it can find until the train is short enough
        -This only works for trains, that knows the station length of the route
        so a full uninterrupted run is needed
        -a train needs 1-2 runs to detect if the shortest station is expanded
        -This feature can be turned on and off in the train replace window
        and each company can have it's own setting
        -NOTE: minor savegame version bump

station_cmd.c

@@ -1083,11 +1083,6 @@ int32 CmdBuildRailroadStation(int x, int y, uint32 flags, uint32 p1, uint32 p2)
 	return cost;
 }
 
-static bool TileBelongsToRailStation(const Station *st, TileIndex tile)
-{
-	return IsTileType(tile, MP_STATION) && _m[tile].m2 == st->index && _m[tile].m5 < 8;
-}
-
 static void MakeRailwayStationAreaSmaller(Station *st)
 {
 	uint w = st->trainst_w;