statistics: Add packages for rgdal

rgdal is an R package(http://cran.r-project.org/web/packages/rgdal/index.html),
installed using regular R means (that don't require puppet). This one is an
interface to gdal, and I think lzia is doing some analysis/research that
requires gdal. Since it just binds to gdal, it requires the packages be
installed via apt.

Change-Id: I0894b784bbe186148ce16007db51c83b311c8e36