Patch by A.M. Kuchling.

Patch by A.M. Kuchling.

Patch by Martin Panter to clean up some problems with the merge
of the codecs docs changes from Python 3.4.

- clarified the distinction between text encodings and other codecs
- clarified relationship with builtin open and the io module
- consolidated documentation of error handlers into one section
- clarified type constraints of some behaviours
- added tests for some of the new statements in the docs

loader.loadTestsFromModule() logged errors.

availability of the function is checked during the compilation. Patch written
by Bernard Spil.

ssl.PROTOCOL_SSLv23 protocol by default, not ssl.PROTOCOL_SSLv3, for maximum
compatibility and support platforms where ssl.PROTOCOL_SSLv3 support is
disabled.

OpenBSD with LibreSSL.