I've added the option to exclude files from review topics,
based on extension.
Pretty simply done - I walk the list as it's built in
Parser->parse, and if it matches an entry in
@exclude_file_types I drop it.
There is one flaw that I know of - if the only files in
the topic are dropped by this, the topic is created empty.
It wasn't clear to me where to fix this, but it hasn't come
up yet in practice, so I didn't chase it down very hard :)
If someone has suggestions on where to fix this, please
let me know.