Restored update_*_0.4.x-0.5.p*, modified upgrade.sh for v. 0.5.1 update_config_0.4.x-0.5.py, update_tables_0.4.x-0.5.pgsql: * restored from tag vmm-0.5 for upgrades from version 0.4.x upgrade.sh: * added stuff for 0.4.x cleanups

- Aliases
    - avoid looping aliases

- Domain
    - optional limits for number of:
        + accounts
        + aliases
        + destinations/alias
        + alias domains