suzerain: add UPPER_C processing

Also, renames BUFUPPER_SCALE_BY(mat,i,j) to just UPPER_C(i,j)
in the 0-0 operator for consistency.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43990 0bd85f0b-c151-43b9-a1e9-27231104551f