OO-2967: refactor the list of assessed identities in assessment tools to be delivered by the resource or the course element them self

OO-2897: implement last modification per user role (as participant or as coach), aggregate the values on structure nodes

OO-2844: add option to show the full text search to guest users, update check access of the different indexers, remove the context aware full text search in forum if the option is disabled

OO-2790: add the options to upload assessment documents on a per course element / user base which behave like the user comment

OO-1593: return more informations on score evalutation, add a specific persistent assessable course node, fix selenium tests and unit tests

OO-558 show LTI nodes in asessment tool only when score transfering is enabled, analog to SCORM element

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

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branch : bps