sourmash v5.0 draft release notes

Draft text: We are pleased to announce release 5.0 of sourmash! This release contains many feature improvements and new functionality, as well as many breaking changes with sourmash 4.0

Please see our migration guide for guidance on updating to sourmash v5, and post questions about migrating to sourmash 5.0 in the sourmash issue tracker!

Breaking changes for 5.0

Numerical output and search results are mostly unchanged

• several tax metagenome output formats will produce different results: in particular, the lineage_summary and krona formats now use abundances, and tax metagenome requires abundance-weighted gather results. You can use --ignore-abund to recover the v4 behavior. See #3711 for details.

New or changed behavior

• the default output format for tax metagenome is now human, instead of csv_summary. You can use -F human to recover the v4 behavior. (#3711)

• sig manifest now defaults to --no-rebuild-manifest - see #3074.

• sig check and sig collect now default to --relpath - see #3071.

Feature removal

Feature/function deprecations

Refactoring, improvements, and minor bug fixes

Documentation updates

Infrastructure and CI changes