added toggle button for htmlcontext, htmlcontext bar now keeps the same size, whether or not tags are shown
fixed a number of class add/remove toggles for vedor-selected using the classList dom api


git-svn-id: https://svn.muze.nl/svn/ariadne-php5/trunk@6665 7882d7ee-46e0-0310-a255-a28a61b628e4