make bddeb work with python3 or python2
painful, and not perfect, but at this point the output builds on a vivid system python2 (bddeb --python2) or python3. * remove use of cheetah by bddeb in favor of builtin renderer * add '--python2' flag to bddeb and knowledge of python 2 and python3 package names. * read-dependencies can now read test-requirements also. * differenciate from build-requirements and runtime requirements.
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