Using moisture sensors to control programs

[dan]

Help with testing would be appreciated.

I added a new branch named run-once.
It has the run_once() code moved from webpages.py to helpers.py.
You should be able to just run

Code:

git checkout run-once

on the command line to get the new code.

There is also a new feature in helpers.stop_stations that logs stations that have been stopped early. That allowed the simplification of the run_once code.

The run_once code in the node-red program has quite a few differences an has been renamed to nr_run_once.
I am still working on refactoring the node-red code to use the helpers code.