Extended Python Debugger

This release contains a number backports from a rewritten version of the code. A "skip" command was added and improvements were made to the "disassemble" command.

Some small bugs and configuration bugs were fixed.
Listing zipped eggs is now supported.

Small bugfixes, document corrections, and
enhancements were made. Tests were revised for
Python 2.6 and Python without readline installed.
A bug involving invoking from ipython was fixed.
The "frame" command is a little more like gdb's.
Exceptions are now caught in runcall().

An experimental feature allows you to drop into a Python or IPython shell (similar to irb for ruby-debug). Parameters are now shown on calls. You can save the current breakpoints and/or settings to a file to be read in during a subsequent debugger session. A gdb-like "annotate" mode was added, improving emacs interaction. Some bugs were fixed and the documentation was updated.

Function tracing, interactive and non-intractive, was added; calls and returns now show the nesting level. Support for Emacs 22 and 23 was added; there is better tolerance for emacs on MS Windows. ipython interaction was improved. BSD make can now be used instead of GNU make to build the debugger. Various bugs have been fixed.