New styling, more focus on content

FIX: bug caused by invalid chars in session name
NEW: complete styling review, wider, calmer coordinated colour scheme,
better CSS spacing between lines, and many other tweaks and IE9 fixes
FIX: delete buttons not hidden in deleted/archive tabs
FIX: jQuery solution for IE9 placeholder text
CHG: better grab handle icon
FIX: misbehaving tool popup icons in IE9
CHG: remove unneeded icons/images