now controlled by a setting.

Validate with app secret, when available.

reset session and reload when user tokens become invalid (user logs out of facebook)

Fixes #2159907: Facebook app ids are integers, and integers are not safe array indicies in Drupal's js settings.

Minor doc fixes.
Fixes to fb_opengraph

misc debug cleanup
misc admin form improvements

No more fb_app(), replaced with fb_get_app().

Fixed JS bug causing extra page reloads.

removed some debug code.
Fixed a json decode issue (in which facebook ID were treated as exponential numbers)

helper functions for fb_get_link() and fb_graph_delete()

better token logic in fb_graph
misc development and fixes

fixes #1679924 by Dave Cohen: Infinite reloads, aggressive cache and third-party cookie problems, and other javascript improvements

by Dave Cohen: more changes from D6 branch merged to D7.  Javascript to show/hide connected markup.  Form alters for user register.

by Dave Cohen: several changes - initialize FB API in hook_custom_theme, earlier in Drupal bootstrap so that it can be used in menu callbacks.  Add method param to fb_graph(). fb_graph_load for menu wildcards.  Cleaned out some obsolete code.

Supports page paths for both liked and not-liked pages.  AKA fan gating.

fixes: #1166272 by Dave Cohen, John Klehm: support for facebooks oauth 2.  Mostly an upgrade of fixes from 6.x branch.

more verbose exception handler.
menu loader for %fbu.