OO-1038: better check of long without exception, try and catch in PersistingCourseGroupManager, unit tests

-no-jira: replace escaping with antisamy for group description as the description is edited with TinyMCE (which already escape special characters)

OO-1000: implements upgrade path for portfolio maps and group rights, test the upgraders for a large set of data

OO-716: replace the flot library in the course statistics with the bar chart component which use d3.js

OO-1014: give the right name to identify the type of image in the repository details, fix the "grayed tone all pictures"!

OO-981: move administration module of catalog to the repository module, update the "administration" features...

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

OO-985: implements the view to retrieve the course and associated data of a user, filter and order by, clean up the code