Working on changing "author" to "group".
Done but not tested.  Any existing SQL database
should be modified using:
    ALTER TABLE session CHANGE COLUMN `author` `group`  varchar(30) DEFAULT NULL;
Found Bug #2418, removed some old files.
After two bug fixes, it seems to work
in both student mode and author mode.
Merge branch 'bvds'
Merge branch 'master' into ritesh
Add getter for given model description that works
for both student and AUTHOR modes.  Removed unused setter.