2.50:

svn merge https://svn.blender.org/svnroot/bf-blender/trunk/blender -r19820:HEAD

Notes:
* Game and sequencer RNA, and sequencer header are now out of date
  a bit after changes in trunk.
* I didn't know how to port these bugfixes, most likely they are
  not needed anymore.
  * Fix "duplicate strip" always increase the user count for ipo.
  * IPO pinning on sequencer strips was lost during Undo.

release/scripts/bpymodules/BPyMathutils.py

@@ -132,7 +132,6 @@ modified for Blender/Mathutils by Campell Barton
 ######################################################################
 # Public interface
 ######################################################################
-from Blender.Mathutils import DotVecs
 def convexHull(point_list_2d):
 	"""Calculate the convex hull of a set of vectors
 	The vectors can be 3 or 4d but only the Xand Y are used.
@@ -197,7 +196,7 @@ def plane2mat(plane, normalize= False):
 	
 	up= cent - ((plane[0]+plane[1])/2.0)
 	right= cent - ((plane[1]+plane[2])/2.0)
-	z= CrossVecs(up, right)
+	z= up.cross(right)
 	
 	if normalize:
 		up.normalize()