Fix issues with multiple ubcpi xblocks in same unit #153
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fix the issue that if there are multiple ubcpi in the same unit,
clicking on an answer text will jump to the top of the page and the
answer is not selected
fix the issue that when the subsection has multiple units with ubcpi,
clicking on submit button will jump to the top of the page
fix the issue that when the student finished Step 1 and switch to
another unit and back, persisted data is not displayed and Step 1 is
displayed again
Closes #152
Closes #33