Added function to do out of sample embedding with input dissimilarity matrix

...st/analysis/rt-read-dissims2/configs-stride.pdb.reference

regtest/dimred/rt-mds2/analysis.0.embed.reference

regtest/dimred/rt-mds2/embed.reference

src/analysis/AnalysisBase.cpp

src/analysis/AnalysisBase.h

src/analysis/AnalysisWithDataCollection.h

src/analysis/ReadDissimilarityMatrix.cpp

src/dimred/DimensionalityReductionBase.cpp

src/dimred/DimensionalityReductionBase.h

src/dimred/ProjectNonLandmarkPoints.cpp

src/dimred/SketchMapBase.cpp

src/dimred/SketchMapRead.cpp

src/reference/ReferenceAtoms.cpp

src/tools/PDB.cpp