[Dovecot] 0.99.10-test8

http://dovecot.procontrol.fi/test/

Again major maildir syncing updates: directory. now it does only one.

• uidlist file is accessed and rewritten a lot less often now than before
• mail duplicates are detected and handled properly by renaming them to new base name
• message flag updates and expunging before did two full syncs for cur/

• some fixes to syncing in read-only / out-of-quota conditions
• before we did always a full sync in cur/ directory when mailbox was opened. now it's done only when needed.
• fixed some crash/index corruption cases

I think syncing should be now very close to having perfect possible performance.