New function rows2varsFS #622

Job	Run time
build (ubuntu-latest, latest, regression)	6m 30s
build (ubuntu-latest, latest, regressionTS)	23m 30s
build (ubuntu-latest, latest, regressionLTSts)	8m 51s
build (ubuntu-latest, latest, regressionEXT)	10m 35s
build (ubuntu-latest, latest, graphics)	41m 54s
build (ubuntu-latest, latest, multivariate)	20m 41s
build (ubuntu-latest, latest, multivariate-clustering)	8m 47s
build (ubuntu-latest, latest, regression-clustering)	15m 29s
build (ubuntu-latest, latest, mixsim)	3m 39s
build (ubuntu-latest, latest, utilities)	9m 45s
build (ubuntu-latest, latest, tclustMULT)	20m 20s
build (ubuntu-latest, latest, tclustMULTgpcm)	28m 38s
	3h 18m 39s

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