[Dovecot] v1.2.12 released

[Timo Sirainen]

http://dovecot.org/releases/1.2/dovecot-1.2.12.tar.gz
http://dovecot.org/releases/1.2/dovecot-1.2.12.tar.gz.sig

Some of the most important fixes since v1.2.11:

	- deliver: Don't crash when a message with Auto-submitted: header gets
	  rejected.
	- lib-storage: Fixed header searches to work correctly when there are
	  multiple headers with same name.
	- dict client: Disconnect from dict server after 1 second of idling.
	- dict: If process crashed, it wasn't automatically restarted
	- dict file: If dict file's group permissions equal world permissions,
	  don't try to change its gid.
	- maildir: Fixed a memory leak when copying with hardlinks.
	- maildir: Expunging last messages may have assert-crashed if their
	  filenames had just changed.