Ensured that weights and periodicities are output when landmarks are output

regtest/analysis/rt-reselect-land/data.reference

...lysis/rt-store-print/analysis.0.output-half.pdb.reference

...is/rt-store-print/analysis.0.output-stride2.pdb.reference

regtest/analysis/rt-store-print/output-all.pdb.reference

regtest/analysis/rt-store-print/output-half.pdb.reference

regtest/analysis/rt-store-print/output-reuse.pdb.reference

regtest/analysis/rt-store-print/output-stride.pdb.reference

regtest/analysis/rt-store-print/output-stride2.pdb.reference

regtest/dimred/rt-mds/analysis.0.list_embed.reference

regtest/dimred/rt-mds/list_embed.reference

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

regtest/dimred/rt-mds2/list_embed.reference

src/analysis/AnalysisBase.h

src/analysis/AnalysisWithDataCollection.h

src/analysis/LandmarkSelectionBase.cpp

src/analysis/OutputColvarFile.cpp

src/core/ActionWithArguments.h