Draft release notes for sourmash v3.4.0

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git log --oneline v3.3.1..master shows:

Major new features:

• enable seamless loading of signatures from indexed databases (use new load_file_as_signatures function more broadly #1059, [MRG] add initial progress reporting wrapper for load_file_as_signatures #1083, [MRG] multigather using index as query #1090)
• add signature cat and signature split commands to combine/split signature files ([MRG] add signature cat and signature split commands to combine/split signature files #1044, [MRG] add --unique to sig cat #1074)
• add compute-optimized MinHash (for small scaled or large cardinalities) in Rust ([MRG] compute-optimized MinHash (for small scaled or large cardinalities) #1045)
• optionally weight lca summarize output by hashval abundance. (Optionally weight lca summarize output by hashval abundance. #1022)
• enable moltypes other than DNA in LCA databases ([MRG] Enable moltypes other than DNA in LCA databases #1013)

Minor improvements:

• add --num-results/-n to gather ([MRG] add --num-results/-n to gather #1047)
• improve lca index error message when inserting num signature ([MRG] improve lca index error message when inserting num signature #1076)
• autodetect FASTA/FASTQ files if given as signatures ([MRG] autodetect FASTA/FASTQ files if given as signatures #1078)
• add is_lineage_match, pop_to_rank, make_lineage to lca_utils ([MRG] add is_lineage_match, pop_to_rank, make_lineage to lca_utils #1081)
• use stricter niffler versions and add new gz feature to it (be more strict on niffler versions, add new gz feature to it #1070)
• added MinHash.clear() and MinHash.add_hash_with_abundance to Python API ([MRG] Add clear option to set_abundances(...) method #1046)

Bugs fixed:

• investigations and fixes around new gather behavior. (investigations and fixes around new gather behavior. #1001)

Refactoring:

• move tests from test_lca into test_lca_functions ([MRG] move tests from test_lca into test_lca_functions #1035)
• remove unused run_shell_cmd function (Refactor functions that use run_shell_cmd() function in test_sourmash.py and test_sourmash_compute.py per #987 #1032)
• refactor some tests in test_sourmash.py to use @utils.in_tempdir decorators (Refactor some tests in test_sourmash.py to use @utils.in_tempdir decorators #1020)
• use install scripts from py-ipfs-http-client ([CI] use install scripts from py-ipfs-http-client #1068)

Documentation:

• Improve documentation around abundance projection ([MRG] Improve documentation around abundance projection #1073)
• Replace recommonmark with myst (docs) (Replace recommonmark with myst (docs) #1021)
• Fix doctest filename error (Doctest permission error #1040)

Thanks to @luizirber @ctb @bluegenes @erikyoung85 for their contributions!

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notes from during release process:

• my rust version needed to be updated to do a build, with rustup update

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released! https://github.com/dib-lab/sourmash/releases/tag/v3.4.0