[bug#49958] [PATCH] More flexibility in opam importer

[Alice BRENON]

- rephrase the documentation.
- remove unnecessary #:ensure #f key in call to (cache-directory).
- clarify what happens when string->uri fails and yields a warning by
  passing a 'bad-repo symbol and commenting at its elimination site.
- make a separate function of get-uri now that it's become as large as
  its caller repo-type.
- mention the possibility to call --repo several times in help message.
- add points at the end of sentences in commit message and in this
  e-mail.

0001-guix-opam-More-flexibility-in-the-importer.patch
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