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: first part of the implementation: remove smack libraries, refactor controller and unify them, implements messaging across the OpenOLAT event bus, implements administration part to enable chat...

OO-388 OO-371 Show correct logged in user count also without IM, remove AJAX icon which clutters the UI

FXOLAT-358: remove more unused classes and packages (SpringController, recorder i18n package, unused layouter)

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branch : bps