Since TikiWiki 2 supports more than one PHP Layers menu at a time, there was no need to continue using the filtering code in the menu module, so it was commented out and can be deleted. I also updated the menu demo pages and in particular removed the tables showing browser and theme behavior. I believe the menus work fine in all compatible themes and in all browsers.
The next step will be to add demos and docs for CSS (suckerfish) menus.
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