Document ERC 5.5 regressions in new 29.1-specific version

[J.P.]

Hi Eli,

I've been mulling over whether ERC might benefit from a 29.1-specific
version (among other workflow-related ruminations in recent months [1]).
Can you see any downsides to adding something like the attached to the
release branch? It mainly involves emitting warnings for known
regressions and also adds comments and documentation to that effect.

Also, as might be obvious, the idea behind the proposed "5.5.0.29.1"
versioning scheme is to retain major/minor/patch semantics for the
leading components and thus allow for eventual superseding by a
"5.5.0.29.2" or a "5.5.1". Alternatively, we could go with something
like a "5.5.1-29.1" (which still compares < 5.5.1) to subtly signify
that this version doesn't coincide with an official ELPA release.
However, one possible downside might be folks thinking this is somehow
markedly superior to the 5.5 ELPA release, when in fact they're
functionally equivalent.

Thanks,
J.P.


[1] https://lists.gnu.org/archive/html/emacs-erc/2023-01/msg00012.html
    https://lists.gnu.org/archive/html/emacs-erc/2023-03/msg00027.html

0001-doc-misc-erc.texi-Elaborate-on-upgrading-via-ELPA.patch
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0002-Explain-ERC-5.5-regressions-in-new-version-5.5.0.29..patch
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