[MERGE] forward port of branch 8.0 up to c41109f
[FIX] Add missings files from previous forward port.
[IMP] website_forum: add a new karma to control the
way links displayed in posts and answers. A nofollow attribute is
added is the author has not enough karma, adding a protection for
spammer tryign to improve their SEO.
[IMP] productbetter menutips and help for product menus.
[website_forum][IMP]  user bio-graphy can be seen as tool-tip if userwho answered to forum has 750 karma or more