heatmap_colormanipulation: revision graph

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Tried to fix output tag in tool test (possibly why "missing tool tests") draft
Fri, 24 Apr 2015 07:47:03 -0400, by mir-bioinf
Removed extraneous NUL file in test-data directory draft
Mon, 20 Apr 2015 17:00:35 -0400, by mir-bioinf

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