Will backport to 2.3.

of the Template.delimiter attribute, we make use of the delimiter in the
escaped group, and in the safe_substitute() method more robust.

Now, .delimiter should be the unescaped delimiter literal, e.g. '$' or '&', or
whatever.  The _TemplateMetaclass will re.escape() this value when it builds
the pattern.

   "AutoReq: 0" to disable automatic dependency searching.

os.path.abspath(self.rpm_base) instead of os.getcwd() + '/' + self.rpm_base

High level error message was stomping useful detailed messages from lower
level routines.

The new approach is to augment string error messages returned by the low
level routines.  The provides both high and low level information.  If
the exception value is not a string, no changes are made.

To see the improved messages in action, type:
   import random
   class R(random): pass
   class B(bool): pass

Treat comparing a date to a datetime like a mixed-type comparison.

module type with silly arguments.  (The exact name can be quibbled
over, if you care).

This was partially inspired by bug #1014215 and so on, but is also
just a good idea.

separates ip address from the port to accommodate ipv6 addresses.

to make it clear that it is possible to pass None as the
separator argument to get the default "any whitespace" separator.

* The parameterization of "delimiter" was incomplete.
* safe_substitute's code for braced delimiters should only be executed
  when braced is not None.
* Invalid pattern group names now raise a ValueError.  Formerly, the
  convert code would fall off the end and improperly return None.

Beefed-up tests.

* Test delimiter override for all paths in substitute and safe_substitute.
* Alter unittest invocation to match other modules (now it itemizes the
  tests as they are run).

Renamed the new generator at Trevor's recommendation.
The name HardwareRandom suggested a bit more than it
delivered (no radioactive decay detectors or such).

most common paths are tested first.  Also, that 'invalid' is better than
'bogus'.

with positional arguments.

with default False for testmod().  The real point of introducing this was
so that output from doctest.master.summarize() would be the same as in
2.3, and doctest.master in 2.4 is a backward-compatability hack used only
by testmod().

modification.  Also, renamed the positional argument to '__mapping' to further
reduce the chance of duplicate keyword arguments.

controls whether tests are included for objects with empty docstrings.
Defaults to True, to match the behavior of Python 2.3.

doctest always promised to stick "__test__" in the name.  That got
broken.  Now it's fixed again.