Rework the way we fetch and verify sets to simplify the process.

Don't fetch SHA256 twice when we are updating from the same repo.
Better output.

Simplify extract_set (becomes extract_sets and deal with all sets at once).

Make sure we cannot pass -s xetcXX and/or -x etcXX.
Bring consistency in condition evaluations.
Drop some unused variables.

with inputs from rpe@

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