Make parallel DSU work and benchmark it#130

Merged

etwest merged 7 commits intomainfrom

Jun 24, 2023

Commits on Jun 17, 2023

make parallel dsu work and benchmark
etwest
committed

Commits on Jun 18, 2023

Commits on Jun 19, 2023

error checking in range_merge
etwest
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Commits on Jun 20, 2023

small adjustments to tests and variable names
etwest
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