OO-1162 make more robust against NPE, fix edit button that could appear when selecting or uploading non editable file
OO-697: fix issue with IE 10, hack for IE 8 not needed with the new synchrone loading of the javascript
OO-1391: replace the search by userProperties map in User by an "exists" using a new and independent mapping of user property.
OO-1376: pluggable help link with implementation for the old help course and the new default which link to openolat confluence