OO-1015: don't log NoSuchFieldException while exporting a group, if the field don't exist, we want that it doesn't exist

OO-1008 add missing selection ordering to persisted editor instance, remove bogus restricted edit mode

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

OO-1010: rewrtie the section form to be FlexiFormed, add rich text edition to the section objectives

no-jira: enhance course db to list of used categories, and accept repository entry keys as course id

OO-973: implements a strict check on ownership of the resources in the query, return only courses where the author is in the owner security group

OO-972: make WebDAV work with Mac OS X 10.9, replace the lock token generator, more code to mimic Apache 2