Get vertical intervals working for 3D Wind Profiler data [1504]

Julien - sorry last round did not correctly handle multiple stations, I was just not very familiar with this Control and sat down with Bob Carp since then, and made the appropriate changes.  A lot of the diffs are cosmetic.  I know I should do that in a separate commit, just no easy way to do that when I'm working on IDV core code.  I try to mark
the meat of the changes with an initials-and-date comment, e.g. "TJJ Dec 2013" so if you search on that you will get to the code changes that directly address the problem(s).

To refresh the topic and test, you can refer back to the old Pull Request I asked you to close:

https://github.com/Unidata/IDV/pull/60

Or to the original bug report in the McV Inquiry System:

http://dcdbs.ssec.wisc.edu/inquiry-v/index.php?inquiry=1504

Thanks much!