- major rewrite

- updated to latest cvs, should work in Drupal 4.2
- added folders, you can move messages in folders, empty folders
- mail once per day if you have unread messages (user option)
- message pruning (move old messages to another table)
- list of contacts: it's built automatically looking at users you write to
- theme()ized
- if you are updating run you just need to run privatemsg.sql