- Fixed: PIT_FindFloorCeiling required tmx and tmy to be set but

P_FindFloorCeiling never did that.
- Merged Check_Sides and PIT_CrossLine into A_PainShootSkull.
- Replaced P_BlockLinesIterator with FBlockLinesIterator in all places it was
  used. This also allowed to remove all the global variable saving in
  P_CreateSecNodeList.
- Added a new FBlockLinesIterator class that doesn't need a callback
  function because debugging the previous bug proved to be a bit annoying
  because it involved a P_BlockLinesIterator loop.
- Fixed: The MBF code to move monsters away from dropoffs did not work as 
  intended due to some random decisions in P_DoNewChaseDir. When in the
  avoiding dropoff mode these are ignored now. This should cure the problem
  that monsters hanging over a dropoff tended to drop down. 

SVN r887 (trunk)

src/p_user.cpp

@@ -242,6 +242,7 @@ player_s::player_s()
   attacker(0),
   extralight(0),
   morphTics(0),
+  MorphedPlayerClass(0),
   PremorphWeapon(0),
   chickenPeck(0),
   jumpTics(0),
@@ -2415,6 +2416,7 @@ void player_s::Serialize (FArchive &arc)
 		<< extralight
 		<< fixedcolormap
 		<< morphTics
+		<< MorphedPlayerClass
 		<< PremorphWeapon
 		<< chickenPeck
 		<< jumpTics