Fix basepoint calc for robustness; don't break if no current exercises.
Merge branch 'nalanda-rct3' of github.com:learningequality/ka-lite into store_tweaks
Store styling, to fit more on one page. Soooo manyyy storeee optionssss!
Sort store items by cost.
Break up purchased items by unit.
Merge pull request #2572 from jamalex/fix_exercise_points

Fix basepoint calc for robustness; don't break if no current exercises.
Merge pull request #2573 from jamalex/store_tweaks

Store tweaks