Added Gecode::max propagator to fd module.
Added Gecode::abs propagator to fd module.
Added Gecode::mult propagator to fd module.
Added Gecode::sqr propagator to fd module.
Added Gecode::sqrt propagator to fd module.
Added Gecode::divmod, Gecode::mod, Gecode::div prpagators to fd module.
Merge pull request #15 from carealejo/master

Gecode Arithmetic constraints