Anno-tool: fixed the freeze that happened when using Ctrl-arrowkey to go to one of the bottom-right corner empty cells of the label button table.
Anno-tool: a few tweaks to the label button area.  Still needs improvement.
Anno-tool: flattened out the HTML template; the mainColumn/rightSidebar hierarchy is obsolete now that the overall layout is dynamically computed.
Anno-tool: added the info buttons and links at the bottom of the page.  They are very basically looking as they should (other than their sizes and colors).