Added new methods to filter and count new question variants
Added view to filter answers by question variant
Added simple migrations script
Simplified posting of JSON; fixed possible migration doc conflict
Conflicting documents are retried
Use temp views to get the most recent documents
Merge branch 'issue-6674'
Fixed missing "self." in front of username/password
Add view to count total answers to a question filtered by PI round
Added views for "learning progress" feature