import v4.2 changelog; populate v5.1 changelog with already voted-in items#514

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abouteiller wants to merge 4 commits intopmix:masterfrom abouteiller:issue513/import42changelog

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Commits on Jan 17, 2025

import v4.2 changelog; populate v5.1 changelog with already voted-in
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5.1 rev history: Mark when an item has been introduced first in 4.2 or 5.0
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Commits on Jan 24, 2025

Correclty count references to deprecated ittributes in chap-revision
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Commits on Jan 29, 2025

Mark section headers with backport from v5 where relevant
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