"rview" has been renamed to "rvu"

As we start the new year, it's time to give a new name to an old friend. Rview is now known as "rvu" in the HEAD release. I included a symbolic link from rvu to rview in the src/rt/Rmakefile install script, so you won't have to start typing the new name right away unless you feel like it. However, the other commands whose names changed do not have links back to their originals, so be careful to clean out your executable directory before the build unless you want to have the old commands hanging around forever. The new names are the ones we discussed earlier:

  calc -> icalc
  gencat -> gencatenary
  lam -> rlam
  neat -> neaten

I have also updated the man pages accordingly, and rad now executes rvu when you give it the -o option. I'm hoping I didn't forget anything -- a lot of files were affected by the change. I'm hoping I don't have to do this again for a looong time!