resolve conflict between lipic format and bookdown regarding environment

[cderv]

This follows #288 (comment) and rstudio/bookdown#1001

and the new option in dev bookdown : bookdown.theroem.preamble

We need to set that to FALSE for some formats where there is a conflict and document

cc @nuest

[nuest]

Thanks for the ping @cderv. So, I'm trying to remember what was the problem here :-)

With bookdown.theorem.preamble set to FALSE, can we switch back to the syntax that was reverted in 75ea637 ?

[cderv]

Yes exactly (or almost if we look at the syntax)

If we set this option to false, this should avoid the conflict of two definition of the environment. This means the syntax supported by bookdown could be used with bookdown::pdf_book

::: {.theorem #testenv-theorem}
Fusce eu leo nisi. Cras eget orci neque, eleifend dapibus felis. Duis et leo dui. Nam vulputate,   velit et laoreet porttitor, quam arcu facilisis dui, sed malesuada risus massa sit amet neque.
:::

I did not try yet with LIPIC format though

[cderv]

@nuest I added the option in the skeleton to show it can be used to deactivate the environment conflict.

[nuest]

Nice!

That means we could switch to the new syntax for theorems, right?

[cderv]

Yes you should be able to. Tell me if it is not working for some reason

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