Removed VP_DEBUG references.

src/control/control-gr.cpp

src/feature/feature-point6d.cpp

src/feature/feature-vector3.cpp

src/sot/solver-hierarchical-inequalities.cpp

src/sot/sot-h.cpp

src/sot/sot-qr.cpp

src/sot/sot.cpp

src/task/multi-bound.cpp

src/task/task-unilateral.cpp