Fix Issue10012 - httplib headers, which are (sometimes mistakenly) int are explicitly cast to str (bytes - in py3k).

Also made the doc string for email._parseaddr's 'quote' function more
accurate; I'd love to make the function match the old docstring instead,
but other code uses it according the existing semantics.

 * test_aswidechar() => unicode_aswidechar()
 * test_aswidecharstring() => unicode_aswidecharstring()

UTF-16 surrogate pairs by single non-BMP characters for 16 bits Py_UNICODE
and 32 bits wchar_t (eg. Linux in narrow build).

And write unit tests for PyUnicode_AsWideChar() and PyUnicode_AsWideCharString().

Bug report and fix by Thomas Guettler.

This fixes a regression noticed by bzr, introduced by issue #9324.

before passing it to the system asctime.  Patch by MunSic Jeong.

Issue #9599:  Further accuracy tweaks to loghelper.  For an integer n that's small enough to be converted to a float without overflow, log(n) is now computed as log(float(n)), and similarly for log10.

And the codec name is normalized.

Redecode the filenames of:

 - all modules: __file__ and __path__ attributes
 - all code objects: co_filename attribute
 - sys.path
 - sys.meta_path
 - sys.executable
 - sys.path_importer_cache (keys)

Keep weak references to all code objects until initfsencoding() is called, to
be able to redecode co_filename attribute of all code objects.

now conforms to the philosophy of bytes and unicode separation in Python 3.
A test suite has also been added.

r85073 changed the importing in wintypes to not use *, so the previous
usage here became even more incorrect.

 * Convert unicode to wide character string before creating the PyCapsule
   object
 * Catch integer overflow
 * Avoid useless memset()
 * Prepare the support of surrogates