VMM/{Config,Handler}: moved Config.install() to Handler.cfg_install().
Handler.cfg_install() must be called explicitly. To avoid 'strange' problems.
Config
   cfs - configset sect.opt val
   cfg - configget sect.opt
   ds - domainservices: smtp pop imap sieve???
- Aliases
    - avoid looping aliases
- Domain
    - optional limits for number of:
        + accounts
        + aliases
        + destinations/alias
        + alias domains
Database:
   public.users.passwd: increase to "character varying(150)"
   	why? `doveadm pw -s SSHA512.hex -p 1`
   public.users.digestmd5: add "character varying(48)"
	Outlook will love it. (`doveadm pw -s DIGEST-MD5.hex -p 1 -u 0`)