Added documentation and examples to many actions

CHANGES/v2.3.txt

src/adjmat/AdjacencyMatrixBase.cpp

src/adjmat/ClusterDiameter.cpp

src/adjmat/ClusterDistribution.cpp

src/adjmat/ClusterProperties.cpp

src/adjmat/ClusterSize.cpp

src/adjmat/ClusterWithSurface.cpp

src/adjmat/ContactAlignedMatrix.cpp

src/adjmat/ContactMatrix.cpp

src/adjmat/DFSClustering.cpp

src/adjmat/HbondMatrix.cpp

src/adjmat/MatrixColumnSums.cpp

src/adjmat/MatrixRowSums.cpp

src/bias/ReweightTemperature.cpp

src/crystallization/Gradient.cpp

src/crystallization/InterMolecularTorsions.cpp

src/crystallization/OrientationSphere.cpp

src/crystallization/Steinhardt.cpp

src/function/Target.cpp

src/gridtools/ConvertToFES.cpp