privatemsg 6.x-1.0-rc2

First DRUPAL-6 branch release candidate.

Too many features to list but i will note the important ones:
1) supports upgrade path from D5
2) supports user blocking
3) supports threaded discussions
4) allows you to tag your messages and filter messages by tags (in drupal 5 this used to be called 'folders')

many many other things were improved and included...

Credit: Alot of features were made possible largely due to incredible help by nbz and Berdir. Thank you guys.