Add web UI

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+ODR-DabMod Web UI
+=================
+
+Goals
+-----
+
+Enable users to play with digital predistortion settings, through a
+visualisation of the settings and the parameters.
+
+Make it easier to discover the tuning possibilities of the modulator.
+
+
+Install
+-------
+
+Install dependencies: cherrypy and jinja2 python modules
+
+Run
+---
+
+1. Execute ODR-DabMod, configured with zmq rc on port 9400
+1. `cd gui`
+1. `./run.py`
+1. Connect your browser to `http://localhost:8099`
+
+Todo
+----
+
+* Integrate DPDCE
+  * Show DPD settings and effect visually
+  * Allow load/store of DPD settings
+* Use Feedback Server interface and make spectrum and constellation plots
+* Get authentication to work
+* Read and write config file, and add forms to change ODR-DabMod configuration
+* Connect to supervisord to be able to restart ODR-DabMod
+* Create a status page
+  * Is process running?
+  * Is modulator rate within bounds?
+  * Are there underruns or late packets?
+  * Is the GPSDO ok? (needs new RC params)
+* Think about how to show PA settings
+  * Return loss is an important metric
+  * Some PAs offer serial interfaces for supervision
+