Removed passing of log to reference objects.

src/analysis/Analysis.cpp

src/colvar/DRMSD.cpp

src/colvar/MultiRMSD.cpp

src/colvar/RMSD.cpp

src/function/Target.cpp

src/mapping/Mapping.cpp

src/reference/EuclideanDistance.cpp

src/reference/MetricRegister.h

src/reference/MultiDomainRMSD.cpp

src/reference/ReferenceConfiguration.cpp

src/reference/ReferenceConfiguration.h

src/secondarystructure/SecondaryStructureRMSD.cpp