OO-3293: add more REST methods to manage curriculums, drop relation between repository entry and curriculum elements

OO-3295,OO-3538: replace Jersey with Apache CXF (JAX-RS 2.1, Spring integration), remove the JAX-WS stack from Sun, update support for OpenMeetings (patch S. Clemenz)

OO-3489, OO-3492, OO-3493, OO-3494, OO-3496, OO-3497: infrastructure to export user data, export  portraits, notes, personal folder, calendars, subscriptions, delete calendars after usser deletion

OO-3477 remove username/email pseudo delete, refactor userdeletemanager to use more the userdatadeletable interface, remove all data from already deleted users

OO-3296: don't upgrade manager roles if administrator and decouple every role, remove double update roles method...

OO-3297: refactor the user management to use organization for managing the roles instead of named security groups

OO-2515: save the master file untouched, deliver  more pixels for the print view of the members course element, add REST api methods to check if a particular size of portrait is available

OO-1593: revert the custom identity mapping, too much side effect, it would need a refactoring of the IdentityImpl mapping

OO-1436: fix an issue with a method's signature, log audit creation of identity and authentication, show errors after import of users...

OO-1341; make the extension of the image mandatory, needed by the java scaling service to discover the type of the image

no-jira: fix a unit test which fail randomly because Grizzly change its HtppSession during processing the request

no-jira: fix documentation of REST API, fix wrong path of the LogWebService, backport RegistrationWebService to OpenOLAT with its unit tests

OO-204: refactor the DisplayPortraitManager to allow portrait saved in PNG and using the new ImageHelper implementation

OO-203: refactor the ImageHelper to use different implementation, add an implementation based on ImageMagick/GhostScript for pictures and PDFs thumbnailing