Get the stable release from CRAN.

To install this package from R-forge use (works only on >= R 2.13!):

> install.packages(c("XML", "RSAGA", "rgdal", "raster", "plyr", "colorspace", "colorRamps", "spacetime",
+ "aqp", "spatstat", "scales", "stringr", "plotrix", "pixmap", "dismo"))
> install.packages("qsarr", repos=c("http://R-Forge.R-project.org"))