mktime() when timezone offest is supplied.

Loosely based on the work by Hirokazu Yamamoto.

Patch by Serhiy Storchaka.

Patch by Hallvard B Furuseth.

The tutorial had some outdated examples.  The patch also adds a caution
about the meaning of parens in the except statement.

Patch by Marien Zwart.

Previously multiprocessing only expected int or str.  It also wrongly
used an exit code of 1 when the argument was a string instead of zero.

Initial patch by mouad

'name' to 'expression' as the latter is what the string actually represents.
The bug in this issue was only catching NameError and AttributeError when
evaluating an expression that was not necessarily a name.

Code patch by Roger Serwy.

Initial patch by Michael Driscoll, I added the example.

options.  Patch by Roger Serwy.

Issue #14775: Fix a potential quadratic dict build-up due to the garbage collector repeatedly trying to untrack dicts.
Additional comments by Tim Silk.

An issue in ctypes.c_longdouble, ctypes.c_double, and ctypes.c_float that
caused an incorrect exception to be returned in the case of overflow has been
fixed.

Original patch by Roger Serwy.