Add tests for getint, getdouble and getboolean methods of the tkapp object.
Issue #21552: Fixed possible integer overflow of too long string lengths in
the Tkinter module on 64-bit platforms.
Fixed possible integer overflow in getint, getdouble and getboolean too (issue #21552).
Issue #21608: Updated HTTPHandler documentation.
Issue #21462 PEP 466: upgrade OpenSSL in the Python 2.7 Windows builds
Merged upstream changes.
Issue #21593: (from StackOverflow) minor doc clarification for re.search.