OO-3189: make the link to about page static, remove the invisible logout link from the index page, cannot open several times the about page without closing it, fix a memory leak in high score

OO-1349: add sort in the list of settings, fix popup velocity if leading and follow-up time is missing, reload the sites gracefully, default order by begin date of list of settings

OO-531: work on tooltip for link, CSS for tooltip, ajax tree replacement in e-portfolio, z-index in dialog, compressed javascripts, update jquery and jquery ui

--HG--
branch : 80-patch

--HG--
branch : bps