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-336: show title of HTML, PDF, Word and Powerpoint if they exist, make repository entry context consistent, make course node consistent

OO-52 remove undesired elements from users visiting card for invited users and never show users login name (privacy)

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branch : bps