Use groupby to speed up user constraints #205
Merged
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(I wanted to make a quick PR to test ReadTheDocs integration.)
This PR implements the suggestion from #185 on the code introduced by #179 (https://github.com/etsap-TIMES/xl2times/pull/179/files/4ea76267c9558b3a08d09ec282b7a5fcaa458f8c#r1489079776) and gets 3% runtime improvement on my laptop.