OO-3265: use a different drag and drop library (dragula), fix double save issue and javascript errors

no-jira: update qtiworks version to 1.0.6 (only changes is using our own jacomax which allow to use Maxima 5.41 on Mac)

OO-3055: enhance REST documentation for document pool, implement back button in document pool administration and taxonomy administration

no-jira: add selenium test for some settings of the lecture module, use the arquillian selenium test suite to make only once the WAR file for all tests...

OO-3055, OO-3047: implementation of taxonomy module with new site, full text search, webdav access, REST API...

OO-2896: implement a plugin for tinymce to count the number of characters of its content (inclusive HTML markup) and enable it for the info messages editor and the forum

OO-2836: add selenium to test hiden section in QTI 2.1 (see OO-2820), hardened open modal dialog and wizard, upgrade drone, remove a lot of @Drone...

OO-2836: update to selenium 3.4, migrate the tests to pass with chrome, add css class mostly in wizards, remove some fieldset in fieldset, add some label around checkbox

OO-2732: implement a matchInteraction with drag and drop (fallback to click possible) with slightly enhanced editor and word export