New function invocation mechanism. This is the major groundwork for handling virtual functions with default implementations properly

[SVN r16390]

libs/python

@@ -1 +1 @@
-Subproject commit dca5c5108b3bc85e0400422d35b4a96b166b706f
+Subproject commit a77a83569495af3a84e2a9c02af3084f9a83d50e