write stderr to irrigation logfile, too
Added basic systemd packaging
* Add systemd init files

* temp hack for debugging
* Do not monkeypatch when called from setup.py

socket.poll() gets deleted and subprocess needs it
* Depend on python-tz if python-pytz does not exist.
* Extend systemd setup
* Fix gevent reactor to not use kill().

Also fix the Makefile
Catch an unset(=None) attribute
* not a float ??
* log broken values