Fix warnings + enforce partially the 80 columns policy.

src/Mathematics/Bsplines.cpp

src/Mathematics/Bsplines.hh

src/Mathematics/FootConstraintsAsLinearSystem.cpp

src/Mathematics/PLDPHerdt.cpp

src/Mathematics/PLDPSolver.cpp

src/Mathematics/relative-feet-inequalities.cpp

src/MotionGeneration/ComAndFootRealizationByGeometry.cpp

src/MotionGeneration/WaistHeightVariation.cpp

src/PatternGeneratorInterfacePrivate.cpp

src/PreviewControl/OptimalControllerSolver.cpp

src/PreviewControl/PreviewControl.cpp

src/PreviewControl/rigid-body-system.cpp

src/StepStackHandler.cpp

...ZMPRefTrajectoryGeneration/AnalyticalMorisawaAbstract.cpp

src/ZMPRefTrajectoryGeneration/AnalyticalMorisawaCompact.cpp

...eration/FilteringAnalyticalTrajectoryByPreviewControl.cpp

...fTrajectoryGeneration/ZMPConstrainedQPFastFormulation.cpp

src/ZMPRefTrajectoryGeneration/ZMPQPWithConstraint.cpp

src/ZMPRefTrajectoryGeneration/nmpc_generator.cpp