Fixed it so WHAM can be used when calculating ensemble averages

regtest/dimred/rt-store-histo/histoC.reference

src/analysis/Average.cpp

src/analysis/DataCollectionObject.h

src/analysis/Histogram.cpp

src/analysis/ReadAnalysisFrames.cpp

src/bias/ReweightWham.cpp

src/core/ActionWithArguments.cpp

src/dimred/SketchMapRead.cpp

src/gridtools/ActionWithGrid.cpp

src/gridtools/ActionWithGrid.h

src/gridtools/ActionWithInputGrid.cpp

src/gridtools/ActionWithInputGrid.h

src/gridtools/ActionWithIntegral.cpp

src/gridtools/FindContour.cpp

src/gridtools/HistogramOnGrid.cpp

src/vesselbase/ActionWithAveraging.cpp

src/vesselbase/ActionWithAveraging.h

src/vesselbase/Makefile