TODO for 2.0
============

  - Horde_Mail_Rfc822_Address

      Store hostnames IDN decoded in object.
      Store personal data MIME unencoded in object.
      Rework idn option to writeAddress().
      Remove adl.
      Remove personal_decoded (same as personal).

  - Horde_Mail_Rfc822_Group

      Store groupname data MIME unencoded in object.
      Remove groupname_decoded (same as groupname).
