#432084 by nbz, Berdir | yaz085, Liliplanet: Added option to display new message indication block without new messages

#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.

#520390 by Berdir | drupup: Added option to configure the display of the send message to themself link.

 #341370 by Berdir, nbz | sbydrupal, mrgoltra: Added 'Send msg to author' link to selected node types.

Mega commit: #314327 (message tagging) by nbz, Berdir. #314066 (upgrade path from d5) by Berdir, nbz.

#311541 by nbz, mrtoner, litwol: Freeze privatemsg db schema + msg delete functionality + changes to query builder