numerous comment, format, and variable name changes

now actually refining before smoothing (GRASS version)

reversed order of refine-and-smooth step

added GRASS/Python implementation of multiscale smoother

added R script to run multiscalesmooth example on Oregon SRTM

switched to more accurate chisq test

enhanced smoother to accept sd as a raster, not just a constant

tweaked var names to match Gallant pub; added comments

fixed vwg step

continued R translation of multiscale smoother