4.2a2

[dellaert]

Changes since 4.2a1:

Not too much changed, this pre-release was driven by the need for html rendering in colabs and jupyter-book.

• html renderers in discrete #1022 html rendering in discrete
• fail fast in linux matrix #1017 fail fast in CI
• Remove Potentials #1013 remove (useless) Potentials class

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This discussion was created from the release 4.2a2.