Function for exporting melted variant view as csv.
Function for exporting melted variant view as csv.

This yields a flat file representation similar to what DBG created for
Recoli 1.

churchlab/millstone,churchlab/millstone,woodymit/millstone_accidental_source,churchlab/millstone,woodymit/millstone_accidental_source,woodymit/millstone,churchlab/millstone,woodymit/millstone,woodymit/millstone,woodymit/millstone_accidental_source,woodymit/millstone,woodymit/millstone_accidental_source