Removes Cython interface

Cython was creating modules that hung indefinitely (and unbreakably) on
import; it was not working, and in general has somewhat poor C++
support, so I'm transitioning to boost::python
Implements boost::python wrapper

The boost::python wrapper for bots::user is written and compiles, but
causes the same infinte hanging on import as the Cython interface. I'll
try implementing the wrapper using the bare python API