rgdal updated

rgdal updated to 0.5.13. I also fixed a problem – I accidentally duplicated the 2.4 version as the 2.5 version. NOTE: the R 2.4 rgdal package is frozen at 0.5.9, since I’ve upgraded to R 2.5, so upgrade to R 2.5 to stay up to date with rgdal. At some point I’ll remove the 2.4 package from the download.