Column "helper" borders should  no longer change the width or height of the column inside the editor.

fix naming between zenbox and zentable, add tinymce specific UI helper (dash line of columns), add css to help tinymce correctly render zenboxes.

Update Zenbox and Layout icons, move to one large icon sprite, update skin css to reflect this change, remove old icons, remove unused JS code for individual zenbox and layout buttons.

fix some css in unl skin that caused buttons with drop down menus to display the arrow below the button

Adding in what is little more than a skeleton module that will dump some example code into the editor.