VMM/Handler: __init__ accepts now a config_type ('default'||'cli').
    - fixed syntax errors, introduced with the last commit.
VMM/Config: added Config.configure() -> NotImplementedError.
VMM/__init__: install gettext global, everything depends on it.
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