[tfenne]

Rewrites the 6.0.0 CHANGELOG section for people upgrading from 5.x: under a third as long (15,300 → 4,300 words), grouped by what a reader needs rather than by the order the work was done.

• New layout:
  • Headlines, each linking to its details.
  • Upgrading from 5.x, by area.
  • Output that differs from 5.x, for anyone comparing files with ones 5.x wrote.
  • New features, led by summaries of VCF and BCF versions, indexing (a table of the index each format writes and reads) and bgzipped SAM.
  • Deprecations.
  • Performance against 5.0.2.
  • Bug fixes by area.
• Bug fixes are one line each, with issue links (reference-style) for the detail. Build and testing notes are dropped.
• Added the user-visible changes the section missed:
  • DiskBackedQueue no longer cleans up on garbage collection.
  • Java-serialized VCF objects from 5.x don't deserialize.
  • The BCF writer refuses a custom IndexCreator.
  • SAMUtils overlap clipping.
  • Several CRAM fixes.
  • Faster SAM parsing.
  • Runtime dependency updates.
• Removed entries describing fixes of bugs no release had.
• The performance table is new: a mirrored A/B of this master against 5.0.2.
• Checked by three reviews:
  • completeness against all 148 commits since 5.0.0 (Opus);
  • every statement against the code and the 5.0.0 source (Opus);
  • a list of every fact the old text had that this one cuts (Fable). Its 14 restore items are back in.
• 5.0.2 and earlier sections are unchanged.

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