OO-622,CL-225: remove username from GUI in place where is not really needed and students can see it. Mark others place with //TODO username where it need more works and/or the username is only visible by author/coach/admin... Additional fix the setup sql for MySQL (index too long).

OO-449: show "do not disturb" status in the homepage, list of course members, list of groups members

OO-449 OO-448 OO-450 fixing configuration issues and dependencies in IM module, adding context help and translations, some GUI optimizations

OO-562: fix the difference between the profile editor and the home page about the visibility of mandatory attributes

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branch : bps