assorted pyflakes fixes I (re-)discovered pyflakes today and ran it over to roundup code to see what it had to say. It reported a ton of "imported module foo but you're not actually using it" warnings and a couple of actual errors that this patch fixes. The code was wrong but it was mostly stuff that never gets executed...like hyperdb.Choice.

This directory is for tracker extensions:

- CGI Actions
- Templating functions

See the customisation doc for more information.