Document: Mathematical Details of Functions in dplR (math-dplR.pdf).
This is not a vignette, i.e. not listed as a vignette and not built
automatically.  A build script is provided (build-math-dplR.R).
There is a reference to the new document in ?ffcsaps and ?gini.coef.
help(package="dplR", help_type="html") shows the document files under
"Other files in the doc directory".

Andy: If you make changes to the document, please add yourself as an
author.  In that case, could you also change the first person singular
sentences accordingly.


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/dplr@864 edb9625f-4e0d-4859-8d74-9fd3b1da38cb