- precomputed variogram vv spans now only the interesting 0:5 days lags (reduces as well calculation times)
- updated vignettes/st.Rnw with smaller temporal extent of vv and new plotting capabilities of gstat
- chnaged examples in Rd-files accordingly
- changed demo stkrige.R accordingly

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/gstat@75 edb9625f-4e0d-4859-8d74-9fd3b1da38cb