2015-07-07: [r9256] change vocabulary: Zone eleves -> Participant View in the supervisor
  class home.
2015-07-07: [r9252] add filter in adm/activity module
2015-07-03: [r9242] in adm/class/userscore, add message in the showsheet page;
 links on exercises in the showsheet page open a new page
2015-07-03: [r9242]
    in adm/class/userscore : add message in the showsheet page;
    links on exercises open a new page
2015-06-29: [r9229] add new commands in oef exercises : \keywords, \observation{},
  \description{}