r_texmf: Add/remove R's texmf tree to/from TeX Live
Description
R ships a custom texmf tree containing a few LaTeX style and class files,
which are required when compiling R packages manuals (Rd.sty) or
Sweave documents (Sweave.sty). This tree can be found under the
directory file.path(R.home('share'), 'texmf'). This function can be
used to add/remove R's texmf tree to/from TeX Live via
tlmgr_conf('auxtrees').