Duplicate an election

Add a button to duplicate an election with it's areas, sections and desks.

A modal open and ask the name for this new election, taking the name of the election duplicated and adding new at then end.

changed milestone to %Generic election

added Front end label

unassigned @apoyen

added To Do label

assigned to @apoyen

added Doing label and removed To Do label

created branch 14-duplicate-an-election to address this issue

mentioned in merge request !16 (merged)

closed via merge request !16 (merged)

mentioned in commit f4d5ae78