additional VisAD examples

I have coded several small VisAD programs over the years to
demonstrate various VisAD concepts. I thought it might be nice
to provide them all from a web site, as one more VisAD resource.

     http://www.ssec.wisc.edu/~curtis/examples/

There are five little applications there so far. They are all
programs that I wrote in response to specific questions on this
mailing list, although I've cleaned them up a bit and added some
comments. If/when I write any more VisAD examples of general
interest, I'll add them to the site too.

-Curtis