It appears the problem is that synth9 was erroneously
included in testing. It involves a nested sequence which
is not translatable. Not sure why it was still there,
but fix is to suppress the test.
Problem was that the NC_create
code was not checking for the NC_CLASSIC_MODEL
mode flag in deciding what dispatch table to use.
This meant that it was then defaulting to use
the default format, and if that was changed
to e.g. NC_FORMAT_NETCDF4, then it would try
to create a netcdf-4 format file, even is
NC_CLASSIC_MODEL mode flag was set.
