Add some newlines to the output of the 'error' function.
Add some newlines to the output of the 'error' function.

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