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Ok, so with this release all parts of Version Control API have been ported and should work, as well as the CVS and SVN backends. (versioncontrol_project most probably needs some more adaptations, and will be finished when the Project module's own Drupal 6 port is nearing completion.)
Rules (previously workflow_ng) support is in place again, now even with support for rule-based sending of notification mails (yay). All API changes that were required for a proper Drupal 6 port are in, I don't expect further API changes until a 6.x-2.x branch starts off. Features are supposed to be just on par with the 5.x-2.0 version.
It's now up to you to test the hell out of this release, and report plenty of bugs in the issue queue. I've tried to be thorough on the code, but I haven't done a lot of testing. Mails, CVS account import/export, as well as the Commit Restrictions and Version Control Account Status modules are completely untested at this time and might fail loudly or in a more subtle way. Your testing is needed in order to make sure everything works as it should.
I'm now going to lean back a while with regards to the API module and wait for your reports. (You might or might not witness me working on the todo list for drupal.org deployment, or on something completely different. You might also want to read through my short report on further plans with the Version Control API.)
Anyways, the Drupal 6 port is done to the best of my knowledge, it's again time to get back to fixing bugs and implementing features.