Backport recent master commits to v0.20.x#1969

Merged

QuLogic merged 6 commits intoSciTools:v0.20.xfrom greglucas:v0.20-pcolormesh

Dec 25, 2021

+77-13

Commits on Dec 14, 2021

Commits on Dec 16, 2021

TST: Updating test tolerances for the v0.20.x branch
greglucas
committed

Commits on Dec 24, 2021