Updated general panels_page settings form validation to prevent errors resulting from names consisting only of numbers.

Another E_NOTICE compliance fix in _panels_page_get_title() that I missed when I fixed the other three.

Heh. The callback functions these menu items were seeking don't even exist. Talk about old, crufty, unused code...that somehow all of us have missed and left in!

The PHP5 version of the css filter was inadvertently committed; this change reverts to the PHP4-compatible version.

Init commit of the basic css filter designed by dmitrig01; reworked for readability. Also the beginnings of a validate function that uses the filter.

There were some instances where object pass-by-ref differences between php4 and 5 were causing inconsistency; these have been fixed. The logic has also been cleaned up so as to emit fewer errors (due primarily to calling undefined array indices) in the course of normal operation.

Hopefully this patch will put an end to a painful series of bugs & unexpected behaviors related to panels_page titling.

#260278 by Pancho, sdboyer: Refactored save routines to be more consistent across the various client modules.

#264263 by Pancho: The menu system was being too strict in checking paths, so it was leaving out paths for tabs that should appear. Thanks Pancho!

#261949 by Pancho: Modify the preview admin form to let the admin user know about required arguments.

#267102 by Pancho, sun: Changed behavior of panels_mini and panels_page admin areas to run certain SELECT queries in batches instead of one by one, lessening the db load.

#271325 by douggreen, mdenson: Changed the _panels_page_get_title() logic slightly to show titles that were incorrectly being hidden in certain circumstances.

$panel_page->display was not being properly switched to the new, relevant display object in certain cases.

#263782 by Pancho, reported by bangpound: Fix panels_page_delete(), so it doesn't throw a warning when deleting a panel_page w/o secondary displays.

#260221 by sun, Pancho. Primarily codestyle cleanup; also fixed some missing leading slashes that were causing the edit icons not to appear in the new helptext for the display editor.