[Dovecot] v1.2.11 released

[Timo Sirainen]

http://dovecot.org/releases/1.2/dovecot-1.2.11.tar.gz
http://dovecot.org/releases/1.2/dovecot-1.2.11.tar.gz.sig

mbox users really should upgrade, because by sending a message with a
huge header you could basically cause a DoS (this problem exists only
with v1.2.x, not with v1.0 or v1.1).

	- mbox: Message header reading was unnecessarily slow. Fetching a
	  huge header could have resulted in Dovecot eating a lot of CPU.
	  Also searching messages was much slower than necessary.
	- mbox, dbox, cydir: Mail root directory was created with 0770
	  permissions, instead of 0700.
	- maildir: Reading uidlist could have ended up in an infinite loop.
	- IMAP IDLE: v1.2.7+ caused extra load by checking changes every
	  0.5 seconds after a change had occurred in mailbox

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