Better handling of single-band calls; ascending / descending cuts#2

Merged

dstndstn merged 4 commits intomasterfrom w3

Nov 11, 2021

+64-19

Commits on Apr 23, 2021

only read metadata files for the bands being processed
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drop frames where the metadata's w?intmedian values exist (are finite)
dstndstn
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Commits on Oct 18, 2021

cut to ascending/descending frames
dstndstn
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Commits on Nov 11, 2021

Merge branch 'master' into w3
dstndstn
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