Various updates/fixes:
Various updates/fixes:

- import into custom fields
- skip importing disabled users, if desired
- update to the bug id regular expression
- don't strip cc fields that don't contain an @ character


git-svn-id: 0d96b0c1a6983ccc08b3732614f4d6bfcf9cbb42@8055 af82e41b-90c4-0310-8c96-b1721e28e2e2

rbaumg/trac,rbaumg/trac,rbaumg/trac,rbaumg/trac