Draft release notes for sourmash v4.3.0

[ctb]

Editing here: https://hackmd.io/RGNKhm63QLKElnI-l1Ye8Q?edit

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git checkout latest
git pull
git log --oneline v4.2.4..latest

New features:

• add sourmash sig grep ([MRG] add sourmash sig grep #1864)
• add sourmash sig summarize ([MRG] add sig fileinfo and standard manifest-generating functionality #1837, [MRG] alias sig fileinfo to sig summarize; minor docs, test cleanup #1863)
• add --include-db-pattern and --exclude-db-pattern to many commands ([MRG] add --include-db-pattern and --exclude-db-pattern to search/gather #1871)
• update lca summarize output to output total counts ([MRG] update lca summarize output to output total counts #1838)

Bug fixes:

• fix sourmash prefetch to work when db scaled is larger than query scaled ([MRG] Fix sourmash prefetch to work when db scaled is larger than query scaled #1870)
• fix sourmash prefetch for multiple ksizes in database ([MRG] Fix sourmash prefetch for multiple ksizes in database #1866)
• allow missing columns in tax CSV files ([MRG] allow missing columns in tax CSV files #1869)
• fix containment calculation for nodegraphs ([MRG] Fix containment calculation for nodegraphs #1862)
• fix tax prepare SQL code for empty/blank taxonomic ranks ([MRG] fix tax prepare SQL code for empty/blank taxonomic ranks #1843)

Cleanup and documentation fixes:

• clean up 'describe' a little bit, add a test ([MRG] clean up sig describe code a little bit & add a picklist test #1861)
• add --output-dir as alias for every --outdir ([MRG] add --output-dir as alias for every --outdir #1817)
• fix doc titles in command-line.md and update description a bit ([MRG] fix doc titles in command-line.md and update description a bit #1874)

Developer updates:

• move greyhound-core into sourmash ([MRG] Move greyhound-core into sourmash #1238)
• drop Python 3.7, default most of CI to Python 3.10 ([MRG] Drop Python 3.7, default most of CI to Python 3.10 #1839)
• reorganize traits for easier wasm and native compilation ([MRG] Reorganize traits for easier wasm and native compilation #1836)
• update asv to newly released version ([MRG] Update asv to newly released version #1834)
• pin setuptools < 60 ([MRG] pin setuptools < 60 #1879)

[ctb]

in draft form - will release when wheels finish uploading.