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

simplify search for duplicate values in SwitchTransform and make it safer for unexpected value nodes

Visual Studio .NET 2003, used by Python 2.5 32 bit, does not support the '__restrict' keyword.

Conflicts:
	CHANGES.rst

int -> Py_ssize_t in cpython pxd files