In page "Configure ranking" button "Next" should be disabled when the user check configure but hasn't pick a method yet. It should be enabled again when a method has been selected
Flags to check whether the "Next" button has being activated have been added. Needs to be adapted due to a bug:
- click on ranking - configurable
- click on consensus - configurable
- click on an option for ranking - configurable
- click on an option for consensus - configurable
Following this order no "Next" button is shown.