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* Game and sequencer RNA, and sequencer header are now out of date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.

source/gameengine/Expressions/EmptyValue.cpp

@@ -121,7 +121,7 @@ const STR_String & CEmptyValue::GetText()
 CValue* CEmptyValue::GetReplica()
 { 
 	CEmptyValue* replica = new CEmptyValue(*this);
-	CValue::AddDataToReplica(replica);
+	replica->ProcessReplica();
 	return replica;
 }