Issue 10326: further extend test for unpickling to ensure type lookup mechanism works after unpickling

Issue 10326: TestCase instances can now be pickled (they store names of instance methods instead of references to the instance methods themselves).

Also corrects a typo from a previous commit.  Unfortunately
this does *not* fix issue #10134.

socket.gethostbyname(socket.gethostname()) can fail when host name resolution is not set up correctly; do not fail test_socket if this is the case.

complex zeros on systems where the log1p function fails to respect
the sign of zero.  This fixes a test failure on AIX.

PY_ULLONG_MAX in pyport.h.  Thanks Hallvard B Furuseth for the patch.

exception catcher.  Wrapping the initial connection routine is not sufficient
as network timeouts can then occur as part of NNTP commands.

:option: is used to create a link to an option of python, not to mark
up any instance of any arbitrary command-line option.  These were
changed to ````.

For modules which do have a command-line interface, lists of options
have been properly marked up with the program/cmdoption directives
combo.  Options defined in such blocks can be linked to with :option:
later in the same file, they won’t link to an option of python.

Finally, the markup of command-line fragments in optparse.rst has
been cleaned to use ``x`` instead of ``"x"``, keeping that latter
form for actual Python strings.

Patch by Eli Bendersky and Éric Araujo.

Adding the wait_for() method to threading.Condition