ubc / ubcpi / 511

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New UI for ubcpi (#168)

* Improve visual consistency

- Revise UI to improve visual consistency
- Fix problem of response missing when switching between units
- Add test cases for new chart format
- Generate and return peer answers on-the-fly if nothing persisted

* Delete learner's state in staff debug

- implement the callback clear_student_state
- add a new submission to indicate existing answers are deleted
- add (but commented out) code to partially support revising score
manually.  But full support will require adding logic to persist the
score within xblock
- fix issue with same explanation displayed multiple times in Step 2
- simplify the Simple algo for picking sample explanation.  Instead of
using arbitrary max loop count of 100 and hope to pick unique explanations,
remove item from the pool once they are chosen.

* Allow students to fresh rationales shown

- on step 2, display a link to allow students to refresh the answers
shown

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