Now 1 interview can have multiple sortings
Now the researcher is able to add a new sorting by clicking a button "save and add sorting".
Introducing this, we need to remove the "discuss sorting" phase and write down that researchers should discuss the sorting in that section, when the user say finished the sorting.
Consider adding a sorting_phase field (default value 1) in the tokens table that indicate in which sorting the token was created.
Since Mesort is already in production, add the column in a new migration file.