order_network -> _sorted_network. No longer member function.
Refactoring

- Move xml functions out of their class since they aren't part of state.

- Move MASTERRANK out of MpiService since it's not state but a constant.

- Move active_work out of MpiService since it's not state but just part of
run_dist.

- Change get_hod default hod_main executable to hod_main.py.

- Add first cut of config files.

- Rejig MANIFEST.in and setup.py to add config files in install.