OO-2531: implement print and download raw dat for QTI 2.1 in statistics views, refine list of users seen by admin, authors, coaches in statistics (courses and resources) and in asessment tool

OO-1593: implementation reset of users data in QTI 2.1 course element and resource, add statistics for resource...

OO-2041: upgrade hibernate and infinispan, update mapping to use TableGenerator with legacy-hilo optimizer

OO-716: replace the flot library in the course statistics with the bar chart component which use d3.js

OO-852: implements the new bulk assessment wizard, move the task executor and scheduler in the services package

OO-750: refactor the mail package to provide a MailManager as a service, enable sending HTML E-Mails, add a customizable E-Mail template with a small editor in admin

OO-531: more tree ajax implementation, fix decay in periodic poller as before, fix js error in statistics if there isn't any datas, fix the NullProvider for qpool

OO-531: work on date chooser, callout and dialog, replace last ajax tree, customize CSS from jqeury components to match openolat GUI

OO-530,OO-537: as follow-up of the work in 8.3, remove some maps which are not really useful, remove more unused variables, remove the views and their mapping...

OO-457: refactor tmp folder in OpenOLAT, use the java.io.tmpdir for all temporary files, configuration for absolute path for the indexer, fix deletion of temporary files in some archives, move qtieditor from tmp