OO-1004: encode softly the webdav names for group and resources to preserve as much as characters as possible

OO-962: fix the RS, enhance the method to accept an array of restricted types, expand and update the unit tests

OO-948: make the ContextEntryControllerCreator cloneable, a cloned creator can save request dependent informations between the calls of the different method to prevent multiple loading of the same resource, calculate severals time the permissions...

OO-922 refactored default tools in collab tools to be thread save, disable wiki run when sec setting, chelp and i18n for security module

OO-911, OO-912: implements the course node triggered buttons in assessment tool, implement bulk upload for tasks with selection of a group if needed

OO-852: fix warn from logging, add commit every 5 user updates, add link to the creator's visit card of a task

OO-887: cache the usernames in UserManager, decouple the AvatarMapper and make it search the username in the cache.

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

OO-798, OO-797, OO-796: update the webdav implementation based on Tomcat, make OpenOLAt work under root context, small refactoring of the dispatchers, push raw files dispatcher to its own servlet, implements Digest authentication...