First round of work & debugging on hide/show panes is complete. In addition to...

First round of work & debugging on hide/show panes is complete. In addition to the new js, php callback processor for the show/hide function, and small css changes to make hidden panes stand out as hidden, some residual cleanup from the big api rewrite. Also fixed a bug that was causing the configure form not to work for existing panes. Not sure why, the code SHOULD have worked fine, but...