Create a Form::Cancel; FormBuilder doesn't automatically add Save/Cancel buttons so this can serve as a Cancel button for it; it attempts to correctly handle either closing the modal pop-up dialog or else going back in history/going back to the page that linked to this one.  needs tests.  the Cancel button in TabSet needs to use this logic.
make Form::Cancel better; make WebGUI::TabForm use it.  so, logic migrated from TabForm to Form::Cancel where it's re-usable and fixed up for this new Doug admin.
fix up Operation::User (op=editUser) some more for the new admin:  give it Save and Cancel buttons, and template it into the style with $session->style->process() so that it gets the headers that it needs for pulling in YUI and stuff like that as well as so that it is styled to look nice.