[repo_update] Address shellcheck issues, simplify pushd+LINK logic #130
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This is an excerpt from #128 containing cleanups and style improvements only. All the functional work on re-entrancy has been dropped, as that needs more time and discussion (and is, for what it's worth, already a far too massive timesink). See that PR for some of the review comments and suggestions.
Most notably this introduces a new function to deduplicate pushd+LINK= logic, whose arguments are always identical except one repository.