add nonzero, also check that we do not pick Python.h from pypy
add slice
invert - this is not in C-API, and maybe we should use this trick for other magic methods too?
convert types
more consistent style (same as pypy_convert)
Merge branch 'master' into more-capi-2
add refcount field to PyObject declaration, just too look at it sometimes
Merge pull request #5 from rguillebert/more-capi-2

Add slice and type convertions, bool and inverse magic methods