Merge branch 'v2.2-explicit-constructors' into v2.2

configure

configure.ac

src/analysis/Analysis.h

src/analysis/AnalysisWithLandmarks.h

src/analysis/ClassicalMultiDimensionalScaling.cpp

src/analysis/Commit.cpp

src/analysis/Histogram.cpp

src/analysis/LandmarkSelectionBase.h

src/analysis/SelectAllFrames.cpp

src/bias/ABMD.cpp

src/bias/Bias.h

src/bias/BiasValue.cpp

src/bias/ExtendedLagrangian.cpp

src/bias/External.cpp

src/bias/LWalls.cpp

src/bias/MetaD.cpp

src/bias/MovingRestraint.cpp

src/bias/Restraint.cpp

src/bias/UWalls.cpp

src/cltools/Driver.cpp