Correction for issue1265 (pdb bug with "with" statement).

When an unfinished generator-iterator is garbage collected, PyEval_EvalFrameEx
is called with a GeneratorExit exception set.  This leads to funny results
if the sys.settrace function itself makes use of generators.
A visible effect is that the settrace function is reset to None.
Another is that the eventual "finally" block of the generator is not called.

It is necessary to save/restore the exception around the call to the trace
function.

This happens a lot with py3k: isinstance() of an ABCMeta instance runs
    def __instancecheck__(cls, instance):
        """Override for isinstance(instance, cls)."""
        return any(cls.__subclasscheck__(c)
                   for c in {instance.__class__, type(instance)})
which lets an opened generator expression each time it returns True.

Backport candidate, even if the case is less frequent in 2.5.

fixed indention to tabs
use Py_RETURN_NONE macro
added more error checks to on_completion_display_matches_hook

open question: Does PyList_SetItem(l, i, o) steal a reference to o in the case of an error?

is a Python hook function. Fixes #1425.

the prweek() method is still broken and I can't figure out how it suppose to work.

Guido prefers _x over __x.

Fixed a bug reported (in private email, by Robert Crida) in logging configuration whereby child loggers of a logger named in a configuration file, which are not themselves named in the configuration, are disabled when the configuration is applied.

used as decorators to create fully-populated properties.

tests don't run directly on import.

hashes with a block size other than 64 bytes (such as sha384 and sha512).

members even though comments to the archive itself aren't currently
supported.

 * get compiling with older versions of python again for a stand alone release.

Improve test_lock's tempdir creation and cleanup.

pay attention to them when opening an existing database.  This means
that d[] behaves properly even on databases previously created with DB_DUP
or DB_DUPSORT flags to allow duplicate keys.

http://sourceforge.net/tracker/index.php?func=detail&aid=477182&group_id=13900&atid=113900

Do not backport, this bugfix could be considered an API change.

I hope the concept of hashability is better understandable now.
Thanks to Tim Hatch for pointing out the flaws here.