DAV_ADD_USER() create a new WebDAV user with login name @uid@
    and password @pwd@. User will belong to the group named @gid@.
     @perms@ are the default user permissions for creation of new
     resources. Additional user info supplied is @home@ directory,
     @full name@ and @e-mail@.DAV_DELETE_USER() remove the existing webDAV user named @uid@.DAV_HOME_DIR() returns the home folder for specified WebDAV user
    named @uid@.DAV_ADD_GROUP() create a new webDAV group named @gid@.DAV_DELETE_GROUP() remove the existing webDAV group named @gid@.