  COMMAND INTERPOLATEDATA
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    Purpose: read in data-points from a file, interpolate 
             the data using splines specified by the global
             parameters SPLINETYPE, SPLINEENDS and SPLINESUBDIV
             and save it
      Usage: INTERPOLATEDATA([<src-filename>],[<dest-filename>])
   Examples: interpolatedata()
             interpolatedata(in)
             interpolatedata(in,out)
      Notes: 1. You can use this command to get an overview about the
                different Dust-Splines (use gnuplot)
             2. The data-file must have at least one column of data,
                all columns will be interpolated
