[Dovecot] 0.99.10-test8

[Timo Sirainen]

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

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