Replacing bubblesort in PURR with quicksort #390
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Noticed significant slowdown when trying to run purr with more samples - ended up being attributable to bubble sort algorithm present in PURR. Replaced bubble sort with a quicksort, significant performance gains apparent in test cases that call PURR.
Test 10: 29.64s -> 2.82s (~10.5x speedup)
Test 19: 79.02s -> 35.70s (~2.2x speedup)
All other tests passed locally. Runtime should now scale almost linearly with increasing
nsampsrather than quadratically like previously observed.