Support for cost-based optimization

TaskModelMiniModelOptimize Support for cost-based optimization Gecode::MiniModel MiniModel::IntOptimizeSpace< IRT_LE > typedef MiniModel::IntOptimizeSpace<IRT_LE> Gecode::MinimizeSpace MinimizeSpace Class for minimizing integer cost. MiniModel::IntOptimizeSpace< IRT_GR > typedef MiniModel::IntOptimizeSpace<IRT_GR> Gecode::MaximizeSpace MaximizeSpace Class for maximizing integer cost. MiniModel::IntOptimizeSpace< IRT_LE > typedef MiniModel::IntOptimizeSpace<IRT_LE> Gecode::IntMinimizeSpace IntMinimizeSpace Class for minimizing integer cost. MiniModel::IntOptimizeSpace< IRT_GR > typedef MiniModel::IntOptimizeSpace<IRT_GR> Gecode::IntMaximizeSpace IntMaximizeSpace Class for maximizing integer cost. Provides for minimizing or maximizing the cost value as defined by a cost-member function of a space.