drop duplicates for pandas pivots #1147
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We recently switched from groupby to pivot to improve performance of data frame exports (#1099), but pivots can fail if there are duplicated data in the pivot table. This PR drops duplicates prior to creating the pivot, in the event that there are duplicates.
This was identified in a rare case, where it appears a user entered multiple dosing regime dose groups that all have the same dose units. A subsequent PR will prevent data entry to prevent these issues.
Bonus - upgrade django