Make interleave-reads.py print output name nicely
Make interleave-reads.py print output name nicely

Currently, interleave-reads.py just prints the open file object. Now, it
will print output.name, i.e. the file path (or '<stdout>' for stdout)

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