[bug#39416] Bulk import of R packages

[Ricardo Wurmus]

Hi Lars,

> this patch series adds 34 packages from CRAN imported using `guix import cran
> -r`.

Thank you!

Could you please also do the following:

* modify the description to contain only complete sentences
* adjust the letter case in the synopsis (CRAN uppercases all initials)
* adjust the indentation with etc/indent-code.el
* use @dfn{Some Long Term} (SLT) in descriptions where necessary
* wrap URLs in the description in Texinfo syntax (especially all the
  <doi:...> things.

-- 
Ricardo