Log Message:
 - provide usable default configuration file (thanks to Ondrej Bezucha for
    testing)
 - change USE_OPENLDAP (which is avtually security/gnupg option) to
   DOVECOT_USE_LDAP, add similar DOVECOT_USE_PGSQL for PostgreSQL support
 - misc cleanups and fixes
 
 At this point the package should be ready to import.