Use nestedSortable jQuery plugin.
Remove debugging lines.
Fix advanced search hooks.
Fix item SQL hooks.
Revert "Update jquery tree margins."

This reverts commit a9047c59e006ad2149295dbd07a92e08b9df72c1.
Temporarily fix page list style.
Change install engine to InnoDB.
Clean up plugin and functions.php.
Enable reordering and deleting with nestedSortable
Merge branch 'nested-sortable'

Conflicts:
	views/admin/css/exhibits.css
Remove jqtree.
Style file selection and attach item button; keep attached item order numbers.
Fix button line-height and spacing between pages in sortable list.
Remove obsolete page order actions.
Remove some unused CSS.
Make page sorting more fancy/usable.
Fix empty attachment issues for some layouts.
Fix exhibit form helper text.
Fix public_head hook attachment.
Fix exhibit item show page.