removed obsolete (fbml-specific) code from fb_canvas.module.  Improved documentation and eliminated php notices.

Expand fieldsets by default when creating new application.

Change the fb_cb url rewrite syntax.  Now use apikey instead of label.  This helps simplify fb_settings.inc.
multiple simplifications (fixes, lets hope) to fb_settings.inc.
fb_session.inc no longer needed (at least for time being).
more sanity checks and output in fb_devel.module

numerous changes, especially to session management and url rewriting. performance improvements and code simplification.

Fixed a bug in canvas page form submits.  And made default handling easier to customize and better documented.

Admin settings to disable post-processing.