VMM/Config: LazyConfigOption.__init__() cast 'default' to 'cls'. If the default value is not None, make sure it has the proper type.

VMM/Config: attributes of class LazyConfigOption are read-only now. Some small code cleanups.

VMM: renamed function chk_domainname() -> check_domainname(). Moved EmailAddress.check_localpart() -> VirtualMailManager.check_localpart(). Some small code cleanups in class EmailAddress.

VMM/Domain: added function get_gid() to the Domain module. We don't need to load all the domain related information from the database, when we need only the GID of a domain. For example in the Alias or Relocated classes.

VMM/{Relocated,Handler}: reworked Relocated class, adjusted Handler.

VMM/{Alias,Handler}: reworked Alias class, adjusted Handler class. Handler: - attribute _dbh is no longer private, the VMM/cli/Handler uses it also. - adjusted to changes in Alias and EmailAddress classes.

VMM/EmailAddress: reworked class EmailAddress again. The attributes domainname and localpart are now read-only.

VMM/EmailAddress: reworked once more. - moved EmailAddress.__chkLocalpart() -> __module__.check_localpart() - renamed EmailAddress.__chkAddress() -> EmailAddress._chk_address() - attributes domainname and localpart are no longer protected - added missing doc strings.

VMM/EmailAddress: rework EmailAddress class.

VMM/Handler: fixed a SyntaxError. Oops

VMM/Handler: __mailDirMake() add warning for skipped mailboxes. - domainInfo() removed old deprecated warning. - fixed PEP8 warnings.

VMM/{,cli/}Handler: reverted most of cs cf1b5f22dbd2 added a cli handler. Moved the interactive stuff from VMM/Handler to the derived VMM/cli/Handler.