enable backup of filters outputs

CHANGELOG.md

library/SolverUtils/Filters/Filter.cpp

library/SolverUtils/Filters/Filter.h

library/SolverUtils/Filters/FilterAeroForces.cpp

library/SolverUtils/Filters/FilterCheckpoint.cpp

library/SolverUtils/Filters/FilterEnergy.cpp

library/SolverUtils/Filters/FilterEnergy1D.cpp

library/SolverUtils/Filters/FilterError.cpp

library/SolverUtils/Filters/FilterFieldConvert.cpp

library/SolverUtils/Filters/FilterHistoryPoints.cpp

library/SolverUtils/Filters/FilterIntegral.cpp

library/SolverUtils/Filters/FilterMean.cpp

library/SolverUtils/Filters/FilterModalEnergy.cpp

library/SolverUtils/Filters/FilterThresholdMax.cpp

library/SolverUtils/Filters/FilterThresholdMin.cpp

solvers/CardiacEPSolver/Filters/FilterBenchmark.cpp

solvers/CardiacEPSolver/Filters/FilterCellHistoryPoints.cpp

...ers/CardiacEPSolver/Filters/FilterCheckpointCellModel.cpp

solvers/CardiacEPSolver/Filters/FilterElectrogram.cpp

solvers/CardiacEPSolver/Filters/FilterHilbertFFTPhase.cpp