added report-to-file option for diginorm
added report-to-file option for diginorm

Winterflower/khmer,kdmurray91/khmer,F1000Research/khmer,jas14/khmer,F1000Research/khmer,souravsingh/khmer,Winterflower/khmer,jas14/khmer,F1000Research/khmer,ged-lab/khmer,ged-lab/khmer,Winterflower/khmer,souravsingh/khmer,ged-lab/khmer,kdmurray91/khmer,souravsingh/khmer,jas14/khmer,kdmurray91/khmer