I had made a change on 6/24/2003 relating to temperature interpolation.

I had made a change on 6/24/2003 relating to temperature interpolation.
Upon further review, I was very misguided, and unfortunately no one slapped
my hand at the time.

Factoring in the environment manager's interpolation scheme, it makes complete
sense to specify the sea level temperature at each boundary and aloft layer.
In fact, this is the only way that allows the temperature interpolation to
make sense, especially around the boundary layer.  This is confusing stuff,
but it now works perfectly. :-)