- added attributes to empirical sample variogram after na.omit might haven been called
- added temporal unit control in covSeparable
- updated the precomputed variogram vv.rda (gamme increased up to ~120)
- updated the vignette "st" accordingly


git-svn-id: svn://svn.r-forge.r-project.org/svnroot/gstat@74 edb9625f-4e0d-4859-8d74-9fd3b1da38cb