ItemViewer menu and QC Tweaks

Updated itemviewer menu CSS to allow menu bar to widen on narrower screens
Updated web.config to allow postback of more than 1000 controls (for many page QC)
Size of QC area is reported back to app and stored in session, to avoid seeing it 'grow' to screen size with each postback
Updated the page name text box to use Server.HtmlEncoding in the name (otherwise error when quotes in the page name)
If user tries to select QC but there are no page images, they are now sent to the page image upload screen