support for site offline canvas page

Cleaned up some database columns that are no longer used.  And they were causing problems for databases in strict mode.

Avoid saving session state after facebook event callback (which is not a regular request from a user)

#360334 (work in progress) use getAppProperties to learn the canvas url, rather than forcing the user to type it.

Changed user handling.
Both of these changes are designed to make fbConnect authentication easier to support.

Initial changes to use new session model (no "adding" of apps).
Still more work to be done version 2.x.

Now, you can create a role manually.  Users who add the app will be given the role automatically.

Numerous changes to Drupal for Facebook.  Significant updates.  Manual configuration changes required.  http://drupalforfacebook.org/node/1055

#238003

Now using php4 client libraries, even if running php5.  This keeps support for php4, while avoiding uncaught exception problems.

Now using fb_infinite to handle infinite sessions keys.  Cron support re-worked to be based on actions.  Actions for performing cron jobs, updating profile fbml, updating fbml references.

Re-arranged a number of things to make it possible to connect to facebook API from non-canvas pages.  Added fb_actions, where actions will live that invoke facebook APIs.

Now using hook_fb to query add-on modules for facebook user id and infinite session key.  This allows us to display information about the facebook user on drupal's user page.  But more importantly lets third-party modules query for any information facebook provides.  And paves the way for interesting actions and cleaner cron implementation.