Add assert for active_threads() to do-partition
Add assert for active_threads() to do-partition

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