Add herustic to get cart stuck less often

git-svn-id: svn://svn.code.sf.net/p/crossfire/code/maps/trunk@20959 282e977c-c81d-0410-88c4-b93c2d0d6712

python/items/roll-o-matic.py

@@ -60,6 +60,9 @@ def handle_move():
 	for check in [0, 1, -1]:
 		d = abs_dir(want_dir + check)
 		if has_floor(x + dir_x[d], y + dir_y[d], floor):
+			# Next time, move in the direction we last moved in.
+			# This heuristic helps follow the roads better.
+			me.WriteKey(key_direction, str(d))
 			if me.Move(d) == 0:
 				continue