modify the weight in the cost fonction (to be verified)

src/ZMPRefTrajectoryGeneration/DynamicFilter.cpp

src/ZMPRefTrajectoryGeneration/ZMPVelocityReferencedSQP.cpp

src/ZMPRefTrajectoryGeneration/nmpc_generator.cpp

tests/TestHerdt2010.cpp

tests/TestNaveau2015.cpp