arraymodule: Fix SF bug 113960.

arraymodule:  Fix SF bug 113960.
    reverse() didn't work at all due to bad arg check.
    Fixed that.
    Added Brad Chapman to ACKS file, as the proud new owner of two
        implicitly copyrighted lines of Python source code <wink>.
    Repaired buffer_info's total lack of arg-checking.
    Replaced memmove by memcpy in reverse() guts, as memmove is
        often slower and the memory areas are guaranteed disjoint.
    Replaced poke-and-hope unchecked decl of tmp buffer size by
        assert-checked larger tmp buffer.
    Got rid of inconsistent spaces before open paren in docstrings.
    Added reverse() sanity tests to test_array.py.