OO-1739: backport the delete button in file element and use it in user profil for the avatar, in the resource description and in the catalog entry editor

OO-1709: set current course version to 10, default recertification timelapse is 0, check if the value is an integer before casting

OO-1645,OO-1595: refactor the personal configuration of calendars, the datamodel of imported calendars, make the description visible and editable...

OO-1647: remove auto-subscribe of course calendar, list of course which the user is member of and which have a calendar ( as configuration or as course element)

OO-1239: allow to delete all references of a resource in the delete process, check if the reference are orphans, managed, owned...

OO-1254: more browser friendly links for download, can delete the certificates, format and orientation for template, inline efficiency statement in course...

OO-1254: implements email, recertification, confirmation for new certification before recertification period, assessment tool without assessable course elements...

OO-1254: first push! implement management for the template at system level, generation of certificate, notifications, certification in assessment tool, auto certification, course configuration (no recertification at this time! )

OO-1184: cache the named group (it's always the same 9 ones), load the extensions right after startup

OO-990: merge run controller with author details in an unified runtime environment for repository entry

OO-990: rework importation of course node with references, implement autowiring capabilities in controllers