Removed unused ConverterGenerators arguments.

Updated arg_from_python<T> so that its operator() is nullary -- it
already gets everything it needs in its constructor.


[SVN r19948]

libs/python

@@ -1 +1 @@
-Subproject commit e563def5ba0520d15fe66da2b40fed86ecc5d55f
+Subproject commit 0133bdfbe3733bbedc62a6680e30335670debfce