suzerain: rename mms0.h5 -> ich0.h5

Will want a boundary layer field available for testing,
so rename the channel field to something mildly descriptive
without forcing reformatting.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44402 0bd85f0b-c151-43b9-a1e9-27231104551f
suzerain: add ibl0.h5 for testing purposes

Intend to use this for parallel and restart consistency checks
for the homogenized boundary layers.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@44403 0bd85f0b-c151-43b9-a1e9-27231104551f