gnu: Add texlive-screenplay-pkg.

* gnu/packages/tex.scm (texlive-screenplay-pkg): New variable.

gnu: Add texlive-screenplay.

* gnu/packages/tex.scm (texlive-screenplay): New variable.

gnu: Add texlive-rtklage.

* gnu/packages/tex.scm (texlive-rtklage): New variable.

gnu: Add texlive-rrgtrees.

* gnu/packages/tex.scm (texlive-rrgtrees): New variable.

gnu: Add texlive-reledmac.

* gnu/packages/tex.scm (texlive-reledmac): New variable.

gnu: Add texlive-qtree.

* gnu/packages/tex.scm (texlive-qtree): New variable.

gnu: Add texlive-qobitree.

* gnu/packages/tex.scm (texlive-qobitree): New variable.

gnu: Add texlive-poetrytex.

* gnu/packages/tex.scm (texlive-poetrytex): New variable.

gnu: Add texlive-poetry.

* gnu/packages/tex.scm (texlive-poetry): New variable.

gnu: Add texlive-poemscol.

* gnu/packages/tex.scm (texlive-poemscol): New variable.

gnu: Add texlive-play.

* gnu/packages/tex.scm (texlive-play): New variable.

gnu: Add texlive-plari.

* gnu/packages/tex.scm (texlive-plari): New variable.

gnu: Add texlive-phonrule.

* gnu/packages/tex.scm (texlive-phonrule): New variable.

gnu: Add texlive-parrun.

* gnu/packages/tex.scm (texlive-parrun): New variable.

gnu: Add texlive-parallel.

* gnu/packages/tex.scm (texlive-parallel): New variable.

gnu: Add texlive-nnext.

* gnu/packages/tex.scm (texlive-nnext): New variable.

gnu: Add texlive-metrix.

* gnu/packages/tex.scm (texlive-metrix): New variable.

gnu: Add texlive-liturg.

* gnu/packages/tex.scm (texlive-liturg): New variable.

gnu: Add texlive-linguex.

* gnu/packages/tex.scm (texlive-linguex): New variable.

gnu: Add texlive-ling-macros.

* gnu/packages/tex.scm (texlive-ling-macros): New variable.