[Dovecot] 1.0-test73

http://dovecot.org/test/

Two potentially dangerous changes:

• mbox parser should now be able to handle CR+LF linefeeds. Hopefully doesn't break anything.
• Some mail header parser changes. Hopefully doesn't break anything.

And other stuff:

• COPY shouldn't crash anymore with 64bit systems
• If PAM modifies username, keep it
• When auth workers died they leaked file descriptors in dovecot-auth
• Auth workers were leaking memory for each request
• Make MySQL connect abort in 10 seconds if it can't connect
• 32bit UID/GIDs were truncated to 31bit value
• dovecot-auth reports cache hits and misses on SIGUSR2