- added some code that prevents overlapping monsters from getting stuck in

each other. PIT_CheckThing will return true under the following contitions 
  now:
  * It was called from P_Move
  * The actor that is blocking the move already overlaps with the monster
    that is being moved.
  * the move will take the 2 actors further apart.  


SVN r2018 (trunk)

src/p_enemy.cpp

@@ -507,6 +507,8 @@ bool P_Move (AActor *actor)
 	}
 	FCheckPosition tm;
 
+	tm.FromPMove = true;
+
 	try_ok = true;
 	for(int i=1; i < steps; i++)
 	{
@@ -518,7 +520,7 @@ bool P_Move (AActor *actor)
 	if (try_ok) try_ok = P_TryMove (actor, tryx, tryy, dropoff, false, tm);
 
 	// [GrafZahl] Interpolating monster movement as it is done here just looks bad
-	// so make it switchable!
+	// so make it switchable
 	if (nomonsterinterpolation)
 	{
 		actor->PrevX = actor->x;