Log Message:
Update to 0.9.12.1

Changes:

        - Fix memory leaks in LDAP, MySQL and PGSQL userdb/passdb
        - Fix hanging when parsing mails that have over 4096 bytes in one
          line (SMTP servers normally don't allow over 1000 bytes so it
          shouldn't be much of a problem)
        - FETCH BODYSTRUCTURE sometimes gave a wrong reply
          (eg. with FETCH (BODYSTRUCTURE RFC822.SIZE) if it wasn't cached)
        - Never return more than one INBOX in LIST even if there are such
          files. They don't work anyway and it just confuses clients.
        - mbox: Don't allow creating INBOX directory by creating/renaming
          mailboxes under it. They just wouldn't work.
        - POP3: Don't return PLAIN in SASL list. We don't support initial SASL
          responses, so it only breaks with most clients that try to use it.
        - IMAP and POP3 login processes may have sent each line in two IP
          packets, one with the data and another with CR+LF. Some clients
          didn't work because of this.