funcky redirect on logout only when needed.
experimental feature to grant role at runtime.

by aangel, Dave Cohen: moved fb_user_app table, which tracks users who have authorized apps, to its own module.

feature #612412 by aangel, Dave Cohen: optionally store user names in human-friendly format.  Also fixes to account create logic.

Expand fieldsets by default when creating new application.

Moved user form alters out of fb_connect and into fb_user.module.