* IMAP: IDLE now sends "Still here" notifications to same user's connections at the same time. This hopefully reduces power usage of some mobile clients that use multiple IDLEing connections. * IMAP: If imap_capability is set, show it in the login banner. + IMAP: Implemented SORT=DISPLAY extension. - Login process creation could have sometimes failed with epoll_ctl() errors or without epoll probably some other strange things could have happened. - Maildir: Fixed some performance issues - Maildir: Fixed crash when using a lot of keywords. - Several fixes to QRESYNC extension and modseq handling - mbox: Make sure failed saves get rolled back with NFS. - dbox: Several fixes.