--HG--
extra : transplant_source : %5D%18L%A0%A91/%B1%96Z%9ECr%07%AD%C7wp%7B%CA

Better support for PyPy's cpyext C-API

rework of optional kw-only arg unpacking

warn when taking char* from a global Python variable

replace plain '#define CYTHON_PEP393_ENABLED' by flag #define as 1 or 0 to make it usable from Cython code

Fix compile error with gcc 4.7 and using c++11

For the new c++ standard a space between simple string concatenation
is mandatory, otherwise it's interpreted as operator"".

Fix a couple of C++ warnings.