A simple step that checks whether the best solution has improved since the last check.
If there is no improvement, restore the best solution (reset the search to start from the best
solution again). The checking is done in the seletion's initialization phase,
no neighbors are actually computed.
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.