Seamm-jobserver

* Fixed a problem if a job returned a status of None, which was reported as an
error.

* Use the value of the environment variable SEAMM_LOG_LEVEL to set the log level for
jobs. DEBUG, INFO, WARNING are three useful levels.

2024.1.17 -- Changes to support running in Docker containers.

2023.12.12 -- Improved the output in the GUI.
* Improved the output to the GUI
* Fixed a bug in the file path for the status file.

* Switched to independent process for Jobs, which means they are fully independent of
the JobServer and continue to run if the JobServer stops
* Discover existing running jobs on startup and monitor them.
* Added status information for the machine the JobServer is on as well as Jobs
* Provide a GUI if run from the commandline, showing the log and status.

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* First release on PyPI.