enable operators.hpp for v2

eliminate dependence on full boost/function.hpp


[SVN r14071]

libs/python

@@ -1 +1 @@
-Subproject commit 92aae63af2995dd0f0cd16a44b461ddec4ca96e5
+Subproject commit 16c391c78cec656a9165de7d5a2fb18ce6ef68cc