- Now it looks for correctly formed tags (not only 'bnc#' but 'bnc#[0-9]+' and so on)
- It doesn't look in the request description anymore, now it checks that
tags appear in the diff of the modified .changes files (and there must be at least
one .changes file being modified)
- The tests have been reworked from scratch, now they're more complete, cleaner and nicer