New functions: predict_rasterEngine, raster_to_GLT, raster_to_IGM.  New parameter for rasterEngine/focal_hpc: .packages.  Bug fixes for rasterEngine and focal_hpc.  Documentation updates.

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spatial-tools@140 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
git-svn-id: svn://svn.r-forge.r-project.org/svnroot/spatial-tools@141 edb9625f-4e0d-4859-8d74-9fd3b1da38cb