Prevent Cython types in annotations from ending up plainly in the __annotations__ dict. Convert them into strings instead.

Add test for ticket #1888: mismatching argument names between .pxd and .pyx files are (not great but) actually ok, but the callers must always see the "public" pxd names, and the implementation must see and use the names given by the implementation.

Closes #1887.

Avoid depending on CPython micro level versions at compile time. Compiling against 3.5.2 does not guarantee that we never get imported on 3.5.1.
Closes #1880.

Add --verbose option for cython magic

Safety fix for #1879: do not raise an exception if setuptools hack fails to apply, but warn about it since it's unclear how to handle such a case.

This fixes issue #1569

Fix abs(long long) test in 32bit MSVC: need to calculate max value in Python as Cython assumes result to be Py_ssize_t (due to sizeof()), which is < sizeof(long long).