RFC: add ability to "source" Python code

[Eli Zaretskii]

> Cc: brobecker@adacore.com, bauerman@br.ibm.com, drow@false.org,
>         pedro@codesourcery.com, gdb-patches@sourceware.org
> From: Tom Tromey <tromey@redhat.com>
> Date: Wed, 11 Feb 2009 13:51:41 -0700
> 
> I respect others' views on this and, in return, I expect mine to be
> respected.

I hope what I wrote shows no disrespect whatsoever.  If it did, I
apologize.