Calculate the results for direct metropolitan election

When selecting a round calculate the results of the election and store it in data store.

The file to calculate the results should be linked to the kind of election.

changed milestone to %Calcul and visualization

added Front end label

added Doing label

created branch 55-calculate-the-results-for-direct-metropolitan-election to address this issue

mentioned in merge request !51 (merged)

closed via merge request !51 (merged)

mentioned in commit 47c633a6