PySequence_Fast isn't so fast after all (due to multiple branching),
was a 35% slowdown for looping over lists. Now it handles tuples as
well with only about a 4% slowdown to lists compared to before.

--HG--
rename : Includes/__cython__.pxd => Cython/Includes/__cython__.pxd
rename : Includes/numpy.pxd => Cython/Includes/numpy.pxd
rename : Includes/python.pxd => Cython/Includes/python.pxd
rename : Includes/python2.5.pxd => Cython/Includes/python2.5.pxd
rename : Includes/python_bool.pxd => Cython/Includes/python_bool.pxd
rename : Includes/python_complex.pxd => Cython/Includes/python_complex.pxd
rename : Includes/python_dict.pxd => Cython/Includes/python_dict.pxd
rename : Includes/python_exc.pxd => Cython/Includes/python_exc.pxd
rename : Includes/python_float.pxd => Cython/Includes/python_float.pxd
rename : Includes/python_function.pxd => Cython/Includes/python_function.pxd
rename : Includes/python_instance.pxd => Cython/Includes/python_instance.pxd
rename : Includes/python_int.pxd => Cython/Includes/python_int.pxd
rename : Includes/python_iterator.pxd => Cython/Includes/python_iterator.pxd
rename : Includes/python_list.pxd => Cython/Includes/python_list.pxd
rename : Includes/python_long.pxd => Cython/Includes/python_long.pxd
rename : Includes/python_mapping.pxd => Cython/Includes/python_mapping.pxd
rename : Includes/python_mem.pxd => Cython/Includes/python_mem.pxd
rename : Includes/python_method.pxd => Cython/Includes/python_method.pxd
rename : Includes/python_module.pxd => Cython/Includes/python_module.pxd
rename : Includes/python_number.pxd => Cython/Includes/python_number.pxd
rename : Includes/python_object.pxd => Cython/Includes/python_object.pxd
rename : Includes/python_parse.pxd => Cython/Includes/python_parse.pxd
rename : Includes/python_ref.pxd => Cython/Includes/python_ref.pxd
rename : Includes/python_sequence.pxd => Cython/Includes/python_sequence.pxd
rename : Includes/python_set.pxd => Cython/Includes/python_set.pxd
rename : Includes/python_string.pxd => Cython/Includes/python_string.pxd
rename : Includes/python_tuple.pxd => Cython/Includes/python_tuple.pxd
rename : Includes/python_type.pxd => Cython/Includes/python_type.pxd
rename : Includes/stdio.pxd => Cython/Includes/stdio.pxd
rename : Includes/stdlib.pxd => Cython/Includes/stdlib.pxd

Also fixed error check.

There should be a way to disable this...