[WIP] Some Python 2 -> Python 3 changes to get the rawfits demo to work#12

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gully wants to merge 1 commit intoKeck-DataReductionPipelines:masterfrom gully:mgs_fixes

+274-279

Commits on Apr 28, 2020

All the Python 2 -> Python 3 changes to get the rawfits demo to work.
gully
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