added debugging message for potential memory overflow
added debugging message for potential memory overflow

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