[Dovecot] 1.0beta3 released

Since there have been so many requests, I guess it's time for beta3 now. There are a couple of issues that I'm still concerned about, but those probably happen with beta2 as well.

If you're beginning to see more connection hangs/timeouts with this release, please tell me.

* Dotlock code changed to timeout faster in some situations when
  the lock file is old.
+ Added support for loading SQL drivers dynamically (see INSTALL file
  for how to build them)
+ Keywords are stored to dboxes, and other dbox improvements.
+ dict-sql could actually work now, making quota-in-sql-database
  possibly working now (not fully tested)
+ Added mail storage conversion plugin to convert automatically from
  one mailbox format to another while user logs in. Doesn't preserve
  UIDVALIDITY/UIDs though.
+ Added plugin { .. } section to dovecot.conf for passing parameters
  to plugins (see dovecot-example.conf).
+ Added ssl-build-param binary which is used to generate
  ssl-parameters.dat. Main dovecot binary doesn't anymore link to
  SSL libraries, and this also makes the process title be clearer
  about why the process is eating all the CPU.
- Fix building without OpenSSL
- Fixed memory leak in MySQL driver
- Fixes to checkpassword
- Broken Content-Length header could have broken mbox opening
- Fixed potential hangs after APPEND command
- Fixed potential crashes in dovecot-auth and imap/pop3-login
- zlib plugin now links with -lz so it could actually work
- kqueue fixes by Vaclav Haisman