snippet authorship

[Graham Percival]

We like to indicate the authors of snippets in LSR (or at least,
some people do, and I'm not prepared to argue against this point),
but I don't want individual names in the docs.  (this would
quickly get ridiculous)

Compromise: could makelsr.py ignore 
% GDB: ...
lines? That way we could tag snippet authorship with
% GDB: Thanks to Foo Bar for this snippet
without cluttering up the official docs.

Cheers,
- Graham