Rather than having a growing collection of bootstrap scripts, we provide a single bootstrap script whose behavior is controlled through environment variables.
* Support python 3.7 and install pyzmq
The latter is needed for testing, and was omitted accidentally.
* Add e3-testsuite
Needed for running the Ada tests.
Master `anod` script that dispatches to subscripts for action.
Add `paths` module, which group common path-related constants.
Improve anod-devel-setup to use e3 and logging.
