[Python-mode] python-mode != gdb

[Skip Montanaro]

    Simson> xemacs on MacOS wasn't a good experience.

Odd, that's precisely the environment I use.  Works fine for me (21.4.15 w/
Apple's X11).  21.5 has problems but as far as I can tell, having tried it
on both MacOSX and Solaris, those problems are not platform-dependent.

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