Changing constants from digits to char

...irtualFluidsCore/Connectors/CoarseToFineVectorConnector.h

...irtualFluidsCore/Connectors/FineToCoarseVectorConnector.h

...idsCore/Connectors/OneDistributionFullVectorConnector.cpp

...s/TwoDistributionsDoubleGhostLayerFullVectorConnector.cpp

...dsCore/Connectors/TwoDistributionsFullVectorConnector.cpp

src/cpu/VirtualFluidsCore/Simulation/Grid3D.cpp

...e/SimulationObservers/AdjustForcingSimulationObserver.cpp

...e/SimulationObservers/AverageValuesSimulationObserver.cpp

...SimulationObservers/CalculateForcesSimulationObserver.cpp

...SimulationObservers/CalculateTorqueSimulationObserver.cpp

...VirtualFluidsCore/SimulationObservers/ForceCalculator.cpp

...lFluidsCore/SimulationObservers/IntegrateValuesHelper.cpp

...ulationObservers/PressureDifferenceSimulationObserver.cpp

...Core/SimulationObservers/QCriterionSimulationObserver.cpp

...ore/SimulationObservers/ShearStressSimulationObserver.cpp

...ulationObservers/TimeAveragedValuesSimulationObserver.cpp

src/cpu/VirtualFluidsCore/Utilities/ChangeRandomQs.hpp

...tualFluidsCore/Visitors/InitDistributionsBlockVisitor.cpp

...isitors/InitDistributionsWithInterpolationGridVisitor.cpp

...VirtualFluidsCore/Visitors/InitThixotropyBlockVisitor.cpp