cleaned up unused imports in experimental branch (using pyflakes)
Replaced "from X import *" with explicit imports, in experimental branch.
Moved dae_impl out of lib9ml/python and into a top-level tools directory.
Temporarily reverted the inclusion of connectivity within abstraction layer `ComponentClass`. I think more fundamental changes are needed, in particular a modular/library-based structure for the abstraction layer, before re-adding connectivity.