akritiko/covid19gr: Pythagoras

CHANGELOG:

• 27 datasets available in total. Since v2.0.0, 5 datasets added and then 3 of them were merged to a single one containing all report sources about COVID-19 in Greece. The single resulting report has a unified logic re fields.
• Aggregations scripts re-factored accordingly.
• Regions vaccinations data are now automatically obtained via the official Greek Government Open Data API. It is now part of the aggregation process flow.
• References structure was updated. We now offer:
  • References per organization (i.e. W.H.O., E.C.D.C., etc.).
  • We link to the Scholarly Communion - Σύνδεσμος Ελληνικών Ακαδημαϊκών Βιβλιοθηκών project containing all Greek academic research re COVID-19 both via the project's dashboard (external link) and via CSV format (in covid19gr repository).
  • We updated the citations selection policy following the T.R.A.A.P. (Timeframe Relevance Authority Accuracy Purpose) method proposed by The Sheridan Libraries, Johns Hopkins University.
• Minor updates to the Resources sector.
• Finally, we introduced a universal open data schema in .json format using the Data Package Creator of frictionlessdata.io.

The dataset is published under the Public Domain CC0-1.0 license. Feel free to reuse!