Issue #1022404 by Berdir, te-brian: Added drag and drop sorting for list display fields and replaced header theme functions with a hook.

#1034378 by Berdir, te-brian: Added Add more recipient types to 'list' sql query, refactor user_load wrapper function.

#901008 by Berdir | BenK: Fixed privatemsg_filter module causes issue with User Relationships module settings page.

#850552 by Berdir | BenK: Fixed URL for non-existent users shows messages for current logged in user.

#555016 by Berdir | neriweaver, trupal218, BenK, nbz, archard, nilsja, kriskd, Liliplanet, yaz085, litwol, Feet, jaron: Added recipient types, allowing to send messages to roles and other recipient groups.

#660092 by Berdir | nbz: Changed inbox to use a tag instead of slow having query and fixed many broken tests.