v0.26.2

Patch release.

• Bundesbank: opensdmx values <df> <DIM> -p bundesbank no longer returns 404, and the description column of info is filled. Codelist requests now apply the provider's metadata_prefix and a new codelist_agency key in portals.json (default ALL); Bundesbank declares BBK. Every other provider keeps codelist/ALL/.... Thanks @paoValle.
• Skill sdmx-explorer: stop at the first dataflow that answers the question, and name the alternative readings (annual average vs Dec-on-Dec, seasonally adjusted vs raw) before picking one.

Note: a Bundesbank description cached empty by the old 404 stays empty until the metadata cache TTL expires.

Full notes in LOG.md. PR: #87