OO-613: unify Onyx QTI 2.1 tools with the OLAT QTI 1.2 tools to remove duplicate code, change the WebService stack for Onyx

OO-535: fix several issues for question pool, delete and copy of items quicker reflected on the gui, search gui issues, doesn't show ID per default in admin part...

OO-623: add fields for managed groups and repository entries, add a lifecycle DB object, enhance the REST API to search with externalId/externalRef...

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-619: more options for single page, SCORM, CP and structure node. Options are the same with the same GUI all over the place

OO-531: fix full page refresh after adding a new course building block, fix scrollTop method everywhere

no-jira: hardened publisher select for update (at the cost of a query), better rollback suppport in DBImpl (possible lost rollback in a hibernate session)

OO-616: adapt the database upgrader to PostgreSQL, remove database upgrade code from standard upgrader...

OO-615: implements a simple filter to allow CORS (cross origin resource sharing) but restricted to the rest api

no-jira: in repository details, open the editor of course the same way it will opened from the course (with breadcrumbs)