- 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/m_bbox.cpp

@@ -25,17 +25,7 @@
 //-----------------------------------------------------------------------------
 
 #include "m_bbox.h"
-
-FBoundingBox::FBoundingBox ()
-{
-	ClearBox ();
-}
-
-void FBoundingBox::ClearBox ()
-{
-	m_Box[BOXTOP] = m_Box[BOXRIGHT] = FIXED_MIN;
-	m_Box[BOXBOTTOM] = m_Box[BOXLEFT] = FIXED_MAX;
-}
+#include "p_local.h"
 
 void FBoundingBox::AddToBox (fixed_t x, fixed_t y)
 {
@@ -50,6 +40,11 @@ void FBoundingBox::AddToBox (fixed_t x, fixed_t y)
 		m_Box[BOXTOP] = y;
 }
 
+int FBoundingBox::BoxOnLineSide (const line_t *ld) const
+{
+	return P_BoxOnLineSide(m_Box, ld);
+}
+