Dieter Maurer's PDB extension.
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``Pdb``, the Python debugger, has severe limitations (apart from some bugs).
This extension tries to get rid of some of them.
Things done
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* setting breakpoints
Allow *filename* to specify a module as well.
Allow setting breakpoints from outside via ``do_break``.
This is useful for debug setups.
* exception display
The current display of an exception is almost useless.
In the ``Pdb`` code, exceptions are displayed at 4 places --
and each of them uses slightly different code (whow!).
We consolidate this into a single function ``_handle_exception``
and present the exception with ``traceback.format_exception_only``.
We also store the ...