[Dovecot] v2.0.15 released

[Timo Sirainen]

http://dovecot.org/releases/2.0/dovecot-2.0.15.tar.gz
http://dovecot.org/releases/2.0/dovecot-2.0.15.tar.gz.sig

	+ doveadm altmove: Added -r parameter to move mails back to primary
	  storage.
	- v2.0.14: Index reading could have eaten a lot of memory in some
	  situations
	- doveadm index no longer affects future caching decisions
	- mbox: Fixed crash during mail delivery when mailbox didn't yet have
	  GUID assigned to it.
	- zlib+mbox: Fetching last message from compressed mailboxes crashed.
	- lib-sql: Fixed load balancing and error handling when multiple hosts
	  are used.