suzerain: #2979 add zgemv55 sans tests

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43792 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: trim accummulate00 for k_x = k_z = 0

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@43793 0bd85f0b-c151-43b9-a1e9-27231104551f