Improve 'Read' type in Python wrapper to better use CPython API facilities.
Improve 'Read' type in Python wrapper to better use CPython API facilities.

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