Metrics
All elements to have the metric API, graph, test and doc.
Notes:
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I updated Dockerfile to add sphinx library for autodoc, and another django module to generate graphical representation of the models (-> duplicates with MR !159 (merged) shouldn't be a pb).
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main.helpers.get_request_user seems to lack an else case.
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main.mixins.JobAuthMixin doc is not consistent with the behaviour. (no impact on metrics)
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I added 2 js libraries, chartJS (chartjs.org, MIT License) and momentjs (momentjs.com, MIT License) required by chartjs to use a time scale.