supporting C integer types `ssize_t` and `size_t`, respectively.

The packaging.install.remove function (a.k.a. the uninstall feature)
takes a path argument to allow client code to use custom directories
instead of sys.path.  The test used to give self.root_dir as path, which
corresponds to a prefix option, but prefix is not on sys.path, it’s only
the base directory used to compute the stdlib and site-packages
directory paths.  The test now gives a valid site-packages path to the
function.

install_lib may be the name of a module, a command or an option, so I
find it clearer to use site_packages to refer to a string object
containing the path of the site-packages directory created in a
temporary directory during tests.

 * Create copy_characters() function which doesn't check for the maximum
   character in release mode
 * _PyUnicode_CheckConsistency() is no more static to be able to use it
   in _PyUnicode_FormatAdvanced() (in formatter_unicode.c)
 * _PyUnicode_CheckConsistency() checks the string hash

would be finalized after the reference to its underlying BufferedRWPair's
writer got cleared by the GC.

This helper was changed to work with any object instead of only modules
(or technically something with a __name__ attribute, see code in 3.2)
but the message stayed as is.

The goal of the regex is to catch a (alpha), b (beta), c or rc
(release candidate), so the existing pattern puzzled me. Tests were
OK before and after the change.

This used to be buggy; Filip Gruszczyński contributed tests and a code
patch but the latter is not needed.

- Using the file role with {placeholders} is IMO clearer than fake
  Python code.

- The fact that sys.version[:3] gives '3.2' is a CPython detail and
  should not be advertised (see #9442), even if some stdlib modules
  currently rely on that detail.

(Deleted rather than moved because multilib implementations vary.)

sys.maxunicode is not called and thus does not return anything; it *is*
something.  (I checked the doc quickly to see if it tells that
expression return things but found nothing.)

I also removed markup that would just generate a useless link to the
enclosing section.