[patch] Add two new header args to LaTeX block

[Juan Manuel Macías]

The attached patch adds two new header args to the LaTeX block:

- `:pdf-process' allows modifying the value of `org-latex-pdf-process'
  locally to the block. This can be useful for evaluating a given block
  with another LaTeX compiler, or even using some custom script.
  Example:

  #+begin_src latex :pdf-process '("lualatex -shell-escape -interaction 
nonstopmode -output-directory %o %f")
  \textbf{hello world}
  #+end_src

- `:full-to-pdf' makes the block like a standalone LaTeX document, which
  should contain everything needed to be compiled, from \documentclass{}
  to \end{document}. Example:

  #+begin_src latex :full-to-pdf yes
  \documentclass{article}  
  \begin{document}
  \textbf{hello world}
  \end{document}
  #+end_src

  I think both arguments can have many practical uses. For example, to
  compile separately and load multiple subdocuments, with different
  preambles:

   #+NAME: doc1
   #+begin_src org :exports none :results latex
    ,#+include: some-document.org
   #+end_src

  #+begin_src latex :noweb yes :results silent file :file file.pdf :full-to-pdf 
yes
    \documentclass{article}
    \usepackage[spanish]{babel}
    \usepackage{fontspec}
    \setmainfont{Vollkorn}
    \begin{document}
    <<doc1()>>
    \end{document}
  #+end_src

  #+latex: \includepdf{file.pdf}
  
  Or even to evaluate ConTeXt code within a LaTeX block:

  #+begin_src latex :full-to-pdf yes :results raw file :file file.pdf 
:pdf-process '("cd %o && context %f")
  \starttext
  \startsection[title={Testing ConTeXt}]
  Lorem ipsum dolor.
  \stopsection
  \stoptext
  #+end_src


Best regards,

Juan Manuel 

-- 
Juan Manuel Macías -- Composición tipográfica, tratamiento de datos, diseño 
editorial y ortotipografía

0001-lisp-ob-latex.el-Add-two-new-header-args-to-LaTeX-bl.patch
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