VMM: renamed function chk_domainname() -> check_domainname().
Moved EmailAddress.check_localpart() -> VirtualMailManager.check_localpart().
Some small code cleanups in class EmailAddress.
-- ---
-- with Dovecot v1.2.x the service managesieve was renamed to sieve
-- ---
ALTER TABLE users RENAME managesieve TO sieve;
DROP VIEW dovecot_password;
CREATE OR REPLACE VIEW dovecot_password AS
SELECT local_part || '@' || domain_name.domainname AS "user",
passwd AS "password", smtp, pop3, imap, sieve
FROM users
LEFT JOIN domain_name USING (gid);