Viewer patches from Jim Wilson:

Viewer patches from Jim Wilson:

Think my brain is getting clogged with matrices :-).  Well I've got the funky
orientation offset bug out of the model code.  In the process the model.cxx
got optimized a bit.  At some point we'll need to liberate model.cxx from the
viewer class, but it is no longer hard coded to access the  "pilot view" to
get it's data. Instead it uses whatever the "current" view happens to be.  I
may try and do that final bit of having models rotate independant of the view
tomorrow night, or start right in on the viewmgr and get a tower view up and
running.  You guys have any preference?  My brother's family is coming to
visit for a few days so what I don't get done tomorrow night probably won't
get done until after the weekend.