[GroupDAV] Attempt to get groupDav connector working with Citadel

[Mathew McBride]

6.0.6 is the newer Funambol version which won't be compatible (or
"supported") with the GroupDAV connector for some time yet. You probably
should fetch 5.0.10 from objectweb.org -
http://forge.objectweb.org/project/showfiles.php?group_id=96&release_id=1981