Multiple fixes to array.extend()

    * Fix self / other typecode compatibility check and add test

    * In CPython, PyErr_BadArgument() C-API function always raises an
      exception and returns zero

    * It is needed to add the `except -2` clause, so that the exception
      raised by PyErr_BadArgument() is not ignored

    * Additionaly, the `return -1` statement in array.extend() will have
      no effect, and hence is misleading, so it needs to be removed
Signed-off-by: Yury V. Zaytsev <yury@shurup.com>

    * Fix self / other typecode compatibility check and add test

    * In CPython, PyErr_BadArgument() C-API function always raises an
      exception and returns zero

    * It is needed to add the `except -2` clause, so that the exception
      raised by PyErr_BadArgument() is not ignored

    * Additionaly, the `return -1` statement in array.extend() will have
      no effect, and hence is misleading, so it needs to be removed
Signed-off-by: Yury V. Zaytsev <yury@shurup.com>

--HG--
extra : transplant_source : e%BE%0A8%0D%B6%A4A%B4%9F%98bZ%ED%C5%CD%D9%AD%E0%7C

prevent assignment from basestring->bytes, provide better error messages, extend string assignment failures test

extend semantics of 'basestring' typed variables to represent exactly bytes/str/unicode but no subtypes

clean up distutils argument handling in cythonize script, avoid unnecessary cwd changing, move intermediate compiler artifacts into temp directory and delete them afterwards

Allow relative path names for cython freeze.