Try to swap a room between two exams. An exam is selected randomly, a
different (available) room is randomly selected for the exam -- the exam is
assigned into the new room (if the room is used, it tries to swap the rooms
between the selected exam and the one that is using it). If an exam is
assigned into two or more rooms, only one room is swapped at a time.
This library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 3 of the
License, or (at your option) any later version.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.