RFC: add ability to "source" Python code

[Eli Zaretskii]

> Cc: Thiago Jung Bauermann <bauerman@br.ibm.com>, Eli Zaretskii <eliz@gnu.org>,
>         Daniel Jacobowitz <drow@false.org>, pedro@codesourcery.com,
>         gdb-patches@sourceware.org
> From: Tom Tromey <tromey@redhat.com>
> Date: Wed, 11 Feb 2009 12:48:59 -0700
> 
> I do not like the cookie idea

Considering that this is the only alternative proposed so far that has
the most chances to be accepted, and that it is 100% backwards
compatible, perhaps you could reconsider.