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.