OO-2575: better handle error during login with defective business path, fix NPE in artefact pool v1 if the portfolio v1 is disabled

OO-2479: reduce overhead everywhere, optimized and simplified query to count the participants of a group, bypass reloading the group set of identities, bypass reloading the base group of business group...

OO-2429: move the foreign key from identity to user, remove double mapping of identity, add more unit tests for invitation, unify the methods to create the user and identity

OO-2196: system-wide configuration for entry point in binder, new binder, new binder from template, new binder from course

OO-1593: rework the interaction behavior of the access rights controller for invitation, fix search invitation per identity, fix rs in invitee mode

OO-2041: upgrade hibernate and infinispan, update mapping to use TableGenerator with legacy-hilo optimizer