added buddylist argument handlers to the views integration, that allow to list usernodes, that are buddies of the argument UID

renamed the list tab to buddylist, so that it is also configurable through the buddylist translations

let blocks and buddylist user settings disappear if the user has no permission to maintain a buddylist and disallow access to buddylist if so

readded the buddylist_translations to the mail_replacments. emails and watchdog notification is working now.

restructured hook_user to allow easier reuse of buddylists elsewhere

added rudimentary online status indicator for buddies. removed dependency on profile module altogether. changed theming of buddylisting pages, so if you have a heavily themed buddylist page, beware of changes.

backporting all changes from cvs version done by quicksketch; adding buddylistinvite module to 4-7 branch