PyArray_FROM_OTF and PyArray_FROM_OT should return type `object`

They were declared as returning type `bint`, but this appears to be incorrect.

http://docs.scipy.org/doc/numpy/reference/c-api.array.html#PyArray_FROM_OTF

http://docs.scipy.org/doc/numpy/reference/c-api.array.html#PyArray_FROM_OT

 external ref assignment

added an option to set the gdb executable

Add missing declarations to libc/stdio.pxd.

Document cythonize accepts Extension arguments.

Fix several MS compiler warnings.

--HG--
extra : rebase_source : 305a362b2f79e4b7982a188ff5912a6621ea56a7

fix build_dir copying

Try using setuptools in setup.py

Fix compatibility with msvc < 1400

make SwitchTransform always generate a 'default' clause to silence C compiler warnings about unmatched enum values