OO-744,OO-784: disable the co-author hidden feature, add a view of the roles in the user personal settings

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).

FXOLAT-424: reduce the number of output in log files from the UserActivityLogging (especially in QTI and EffiencyStatment)

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branch : bps