suzerain: sed to workaround h5dump whitespace

Prior versions of this script showed HDF5 release-dependend
behavior due to h5dump being weird about whitespace.  This
is an attempt to fix that by trimming all leading whitespace
and stitching up trailing newlines using sed.

git-svn-id: https://svn.ices.utexas.edu/repos/pecos/suzerain/trunk@45362 0bd85f0b-c151-43b9-a1e9-27231104551f