(svn r9350) [0.5] -Backport from trunk (r9105, r9115, r9117, r9146):

- Fix: disable the ability to make flooding water with the canal build tool. In the scenario editor you can still make both canals and flooding water at height level 0 (r9105)
- Fix: make clear in the tooltips when the canal build tool (in the scenario editor) makes flooding water (r9115)
- Fix: difficulty level button was not selected when opening the difficulty window (r9117)
- Fix: "Train is lost" message is generated incorrectly (r9146)

train_cmd.c

@@ -2250,6 +2250,7 @@ static bool NtpCallbFindStation(TileIndex tile, TrainTrackFollowerData *ttfd, in
 		 * approximation of where the station is */
 		// found station
 		ttfd->best_track = track;
+		ttfd->best_bird_dist = 0;
 		return true;
 	} else {
 		uint dist;