Added 100x faster vectorized version #39
Merged
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Would be ~500x faster if we didn't have to do the footprint loop.
The if branch between vector and non-vectorized versions (and associated split in code logic) is unpleasant, but we'll have to live with it until we finalize the discussion here: https://community.lsst.org/t/memory-contiguity-and-python-execution-speed/884/12