suzerain: fix incorrect ensure

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44601 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: fix /kx yet again

Had failed to account for logical vs actual grid sizes.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44602 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: #2998 symmetry bugfix

Logical grid.N.x() is grid.N.x()/2+1 modes due to r2c usage.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44603 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: #2998 fix xlocal striding

The wall-normal pencil is stride 1, and that's
what I'm computing across here.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44604 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: correct wavenumber indices

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44605 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: #2998 attempt to sort out scaling

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44606 0bd85f0b-c151-43b9-a1e9-27231104551f