Ironing out bugs discovered in testing multiple criteria

Includes:
- Changing when number of comparisons completed is divided by number of criteria
- Updating logic for when to display "Not enough answers" text
- Moving answer score column on Participation tab
- Moving where answer pair error displays on Compare Answers Screen
- Adding title to main navbar link
- Removing edit/delete actions for answers when answer/compare periods overlap
- Updating logic for when to display "Compare answers" text on Question Screen