various small changes

src/GksGpu/BoundaryConditions/CreepingMassFlux.cu

src/GksGpu/BoundaryConditions/HeatFlux.cu

src/GksGpu/CellUpdate/CellUpdate.cu

src/GksGpu/CellUpdate/Reaction.cuh

src/GksGpu/FluxComputation/AssembleFlux.cuh

src/GksGpu/FluxComputation/FluxComputation.cu

src/GksGpu/Parameters/Parameters.h

src/GksGpu/TimeStepping/NestedTimeStep.cpp

targets/apps/GKS/Candle/Candle.cpp

targets/apps/GKS/ConfinedCombustion/ConfinedCombustion.cpp

targets/apps/GKS/PoolFire/PoolFire.cpp

targets/apps/GKS/RoomFire/RoomFire.cpp

targets/apps/GKS/SalinasVazquez/SalinasVazquez.cpp