Fix some diagnostic messages erroneously sent to stdout instead of stderr
Fix some diagnostic messages erroneously sent to stdout instead of stderr

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