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

OO-1867: upgrade selenium and arquillian libraries to support Firefox 46 and update the tests to work with them

CL-526: display user  interest and user searched interests properties side by side if the two are present

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-1819: add param for inital author, add param to not set the initial author, return more infos for course members

OO-1593: revert the custom identity mapping, too much side effect, it would need a refactoring of the IdentityImpl mapping

OO-1785: revert order of first name and last name, make not mandatory property visible but not by default

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-1741 remove ? from dummy avatar images, adding anonymous avatar and removing old avatar images outside the theme