Adds heading styles to rte-content.jsp.
Changes referential text to use the new HTML clean-up logic from Dari.
Renames trackChanges class to rte-trackChanges for RTE so that it's more consistent with other namespaced class names.
Fixes track changes button in RTE toolbar to expand its full width.
Fixes delete key not working within <del> and across multiple nodes in RTE.
Fixes $.rte to handle both BACKSPACE and DELETE and fixes it wiping out text on special key presses.
Fixes delete key presses within <ins> not deleting the text if there was a selection.
Changes track changes to only enable itself if the document is invisible (e.g. draft).
Fixes permission check almost always failing when presenting the publish button.