[Dovecot] v2.0.16 released

[Timo Sirainen]

http://dovecot.org/releases/2.0/dovecot-2.0.16.tar.gz
http://dovecot.org/releases/2.0/dovecot-2.0.16.tar.gz.sig

I only now noticed that the VSZ limits weren't being enforced with
earlier v2.0.x releases (or they were set 1024 times too high). So if a
Dovecot process was leaking memory, it wasn't being killed by kernel.
Now that this enforcing is done, some installations will probably start
seeing errors about reaching these limits in normal operation. The
default_vsz_limit is 256 MB. You may want to increase it in larger
installations to 1 GB just in case.

Besides the changes listed below, a lot of smaller fixes were done.

v2.0.16 2011-11-17  Timo Sirainen <tss at iki.fi>

	* VSZ limits weren't being enforced for any processes. On server with
	  large mailboxes you may now see errors about it if the limits aren't
	  high enough. To fix them, either increase individual service {
	  vsz_limit } values or simply increase the default_vsz_limit setting.
	* Proxying: If using ssl=yes or starttls=yes with a hostname (not IP)
	  as proxy destination, require that the certificate matches the given
	  hostname.
	* LMTP: Changed default client_limit to 1. This should improve LMTP
	  throughput with default settings.
	* dsync: Quota is no longer enforced (i.e. dsync can't fail because
	  user is over quota).

	+ Added "auto" mail storage driver, which can be used to autodetect
	  mailbox location and format. This behavior is already the default
	  for empty mail_location setting, so this change is mainly useful for
	  shared namespace's location setting.
	+ checkpassword: Export all auth %variables to AUTH_* environment.