VMM/Config: reworked configuration handling.
Implemented LazyConfig(RawConfigParser) and LazyConfigOption(object)
Rewrote Config class:
* use default values and added some validation stuff
* removed attributes: __VMMsections and __changes
* replaced methods __chkSections() and __chkOptions() with __chkCfg
VMM/VMM: Adjusted to reworked Config class.
* removed attribute __cfgSections
* removed methods: cfgGetBoolean(), cfgGetInt(), cfgGetString()
* added methods: cfgDget(), cfgPget(), cfgSet()
VMM/__init__: added function get_unicode()
vmm: Adjusted to replaced methods in VMM/VMM.
-- ---
-- 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);