dramatic speed improvements and code cleanup#69

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Neywiny wants to merge 4 commits intomhostetter:maint-3.10from

Commits on Sep 1, 2025

dramatic speed improvements and code cleanup
Neywiny
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Commits on Sep 2, 2025

fix comparing with non np array
Neywiny
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Commits on Sep 7, 2025

simplify and speed up first stage of correlator
Neywiny
committed

Commits on Oct 5, 2025

change to py native bool per numpy depracation
Neywiny
committed