New example: converting data file formats

Input file with time series data: 
some comment line
1.5
  measurements  model1 model2
     0.0         0.1    1.0
     0.1         0.1    0.188
     0.2         0.2    0.25
Contents: comment line, time step, headings, time series data
Goal: split file into two-column files, one for each time series
Script: interpret input file, split text, extract data and write files

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