Improvements to support STT-1397
Incorporated ppr scoring validation into endpoint, added tests, and updated FE to display tenths if left un-updated, display hundredths if updated.
Hundredths support was requested in STT-1354.
I provided Allie a preview of this treatment and support of tenths vs. hundredths. She indicated that she doesn't have strong opinions about it and wants to look for feedback during internal/external review.