cleanup of filter script
cleanup of filter script

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