PERF: Rewrite assign_candidates() for speed.
Merge pull request #76 from nkeim/batch-assign

PERF: Rewrite assign_candidates() for speed.
BUG: Fix typo in refine refactor that regressed subpx accuracy.
TST: Minor: adjusted test related to no-feature warnings.
BLD: Update conda and specify versions of packages.
Merge pull request #77 from danielballan/refine-bug

BUG: Fix typo in refine refactor that regressed subpx accuracy.