OO-1873: replace the listing of booking by a native query optimized for our standard setup, replace the .hbm.xml with annotations, add more fetching overall

OO-1770, OO-1769: allow pseudonym and guest posts, refactor the message model to hold only threads or messages of a unique thread in memory, minimize the number of joins on query, minimize the number of queries on peekview, remove buggy docking feature...

OO-1616: replace the view for the business group lists with several customized queries which load only the needed data

OO-1615,OO-1616: remove dependency to Spring ORM, remove hook between OpenOLAT and Spring Transaction, make the dependency path to DB from LockManager clearer, refactor LockManager

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

OO-1553: add the pending reservations to the number of selected places, refactor reservation to use annotations

OO-91: add more informations to the list of groups and assessed identities and fix some other issues

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

OO-1408: improve performance with native SQL queries, add all queries needed for authors to see their courses and the groups linked to their courses

OO-1391: replace the search by userProperties map in User by an "exists" using a new and  	independent mapping of user property.

OO-1343: add three different style choices to catalog, refactor the catalog admin, refactor the image pipeline of the catalog to reduce the number of scaling

OO-1257: implement REST API for efficiency statement and certificate, standalone or linked to a resource

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-1197: reimplement the views with select queries, add unit tests with all possible order by, fix the lack of order by in the lucene search...

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

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

OO-936: implements course element "check list", enhance the flexi-table with sort, filter and export, enhance publish process with an update step, upgrade pdfbox to version 1.84