__Pyx_decode_c_string: check for overflow when calling strlen.

Fixes http://trac.cython.org/ticket/864.

--HG--
extra : amend_source : d2a97da4f942d555723b9bfa488985c5e5c27721

fix cname override for helper functions: 'str' compile time values no longer require decoding in Py3

make str values in compile time DEF env turn into actually usable Unicode strings when compiling under Python 3

copy over "test_call.py" test from CPython 3.5+ to disable an error test that prevents it from building in Cython

Fix typos.

Conflicts:
	CHANGES.rst

Conflicts:
	CHANGES.rst

revert integer literal suffixing again and instead generate C hex literals if no suffix is used to make the C compiler consider unsigned types for their values (see C standard 6.4.4)

Allow passing more than two -v's to cygdb.

Constants in float.pxd are not integers.

Additions to includes

- append U-suffix only on coercion when the target type is unsigned
- append L/LL-suffix when value looks too large for a smaller constant value type

- append U-suffix only on coercion when the target type is unsigned
- append L/LL-suffix when value looks too large for a smaller constant value type

undef unwanted defines from longintrepr.h