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Restore "attrs" template variable support (#861)

* fix lost "attrs" variable

* provide `CHANGES.rst` entries

* fix `isort` problem

* fix typo

* tentatively remove workarounds for `https://github.com/malthe/chameleon/issues/323`

* Revert "tentatively remove workarounds for `https://github.com/malthe/chameleon/issues/323`"

This reverts commit 5f492756b.

At least for the moment, `chameleon` is not yet ready to drop the work around.
In addition, our test suite is not sufficiently complete to verify the safety
of all `chameleon` features without the work around in place.

* clearly state in the comments related to `chameleon` work arounds that those might go away with ``chameleon > 3.8.0``;
add a not to the Zope Book that ``chameleon`` implements `attrs` and `default` in a special way and that their value should not be changed

* add test for `CONTEXTS`; restore `CONTEXTS` related documentation (improved)

Co-authored-by: Jens Vagelpohl <jens@netz.ooo>

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