please test the new Patcher

Dear friends, here's a new version of Patcher that I'd like you to test. If everything goes well, I'll commit it in a few days. This version mostly has the following new features: - support for different ChangeLog layouts in the message. ChangeLogs can now appear as part of the patch (same diff command as for the other files), diff'ed with another command (for instance `diff -U 0'), or as pure text like before. - support for subject prefix customization. You can now customize the subject prefix (currently "[PATCH]") and also provide an alternate "committed" version. This will mostly interest the other reviewers, I think, as using the hideous [PATCH APPROVE] and [PATCH APPROVE COMMIT] tags is now automatic. Please customize the options `patcher-default-change-logs-appearance', `patcher-default-subject-prefix', `patcher-default-subject-committed-prefix', and their respective project options. -- Didier, going back to lethargy again ...