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.
.. Substitutions in section 1
.. |account.disk_usage| replace:: `account.disk_usage`
.. _account.disk_usage: vmm.cfg.5#account-disk-usage
.. |domain.force_deletion| replace:: `domain.force_deletion`
.. _domain.force_deletion: vmm.cfg.5#domain-force-deletion
.. |misc.transport| replace:: `misc.transport`
.. _misc.transport: vmm.cfg.5#misc-transport
.. #EOF