fixed threshold/break_on_circum code
fixed threshold/break_on_circum code

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