Hi,

I am attaching a new version of my patch for adding LaTeX attributes to
verse blocks. Following the kind suggestions from Timothy, I have also
documented this new features that I propose. I don't know if I have done
it correctly and in the right place...

A short reminder: `lines', `versewidth', and `center' require loading
the LaTeX package verse.sty (https://www.ctan.org/pkg/verse), which is
an extension of the standard LaTeX `verse' environment, and that adds
many features for typesetting poetry. `lines' deals with the marginal
verse numbering; `versewidth' and `center' are related to the optical
centering of the poem. The fourth attribute is to include arbitrary
LaTeX code within the verse environment, so I have provisionally named
it `latexcode'.

Of course, Feedback is welcome.

Regards,

Juan Manuel