fix CythonInclude after importlib changes, avoid searching for the built module, avoid changing sys.path

Conflicts:
	Cython/Compiler/ParseTreeTransforms.py

Revert Numpy 1.7 hacks

This reverts commit 95b6e693.

This reverts commit 1eabb1c6.

This reverts commit 6f2271d2.

Conflicts:

	Cython/Compiler/ParseTreeTransforms.py

This reverts commit 29d68530.

move utility code reference of __Pyx_Method_ClassMethod() into Entry to allow its eventual removal at a later stage

--HG--
extra : transplant_source : 4%93%F3HQ/%0C%D4%28%FB23%1E%F6%FE%E1%D8%8AT%EB

--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