OO-3067: Handle exception if a course reminder rule is invalid and add some validations in GUI to avoid invalid reminder rules
OO-3064: disable drawing interaction test until I found why it fails with the new google-chrome driver
OO-3058: disable the optimistic locking by efficiency statement and replace with last commit win (in all case, the last which compute it win, locking or not)
OO-3057: tweak performance of the synchronization of LDAP groups, make a set of identity keys to match the users
