OO-662: fix bad performance in catalog if instance contains a certain amount of members only courses

OO-568: fix memory leak, remove inner class to prevent big memory consumption if an other memory leak...

OO-530,OO-537: as follow-up of the work in 8.3, remove some maps which are not really useful, remove more unused variables, remove the views and their mapping...

OO-490: improve performance of the rendering pipeline by sharing the writer, copy direct the result to the servlet output stream / writer, start some buffer with a more realistic size, make some components in flexi lazy...

OO-377: map the reservations to the right roles, upgrade waiting list after a cancellation, better choice of templates, fix remove of reservations as coach/admin

OO-460: make the spring xml configuration easier to configure with the profile function of spring 3.1

OO-271: refactor the user session management, move the the logic in its own manager, persist the time out values, make the admin GUI a bit better

OO-413: propose an alternative course node implementation, process the alternative node, mark the other as deleted...

OO-417: refactor the submit process in QTI, all the back end jobs are done at the same time with delegates, course node attempts increments, save on the database, generating reports...

OO-377: implements pending state or reservation for groups and repository entry access to participants

OO-386: remove the async executor of the repository manager and replace it with a evict from cache, select for update, merge process

OO-372,OO-96: implements mappers which can be persisted on the database, implements the infrastructure, implements the scorm mapper and the file mapper for iframe to be serializable/deserializable,

OO-373: made the notifications manager robust under concurrent access, write more unit tests to tests the queries on the database and test it under concurrent load

OO-293: better back support in course (run), better switch between sites and dynamic tabs, better behavior after closing a tab (stack of previous tabs/sites not limited to 1 site)

OMA-87: enhance the REST API for notifications, add more informations about forum and folder notifications

OO-291: first step: move business gourp manager to a business group service, remove dependency to the context...