#108671 patch by nodestroy: fixes bugs with multiple requests by moving from forms to links with confirmation questions

Fix warning that is issued when no administrator mail address is set for the site. The previous implementation didn't work without clean URLs

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

restructured hook_user to allow easier reuse of buddylists elsewhere

#80116 patch by ankur #26: Prevent the "add user to my buddylist" link from appearing if a request is pending

#80166 by ankur: optional workflow to send request emails to the user who must approve or deny the request to become buddies.

zapping the forked, out of date, untagged CVS version of buddylist. Adding info into the README explaining why.

minor usability improvements; message upon install if profile module isn't enabled and no link to profile pages for users without the view profiles permission

I don't like the term "buddy". I think of this as a contacts module. So now all the "buddy" variations are their own translations and you can translate just those terms to change buddy to contact, or friend, or ferret etc.

- database schema changed: normalized representation of buddies and buddy groups.
- new interface for managing buddy groups
- new display of buddy groups
- new display of buddies' recent posts (depends on tracker module)

TODO: hook_install, buddylist.install, PGSQL