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()

put name and email into registration form, when known

better token logic in fb_graph
misc development and fixes

not sure it should stay this way, but theme and format hooks not yet working in this branch.

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

fixes #1689788 by Dave Cohen: removed broken language code.  i18n support in canvas pages may be broken.

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

Fixes #1117214 by Dave Cohen,james.williams: fixes a PHP warning on account form, and probably fixes a bigger problem in which mappings to facebook accounts are accidentally deleted.