h4h5tools

Correctly convert HDF-EOS2 fields of character type.

Previously, the converter converts those fields into netCDF-4 variables of SCALAR spaces. This made netCDF API nc_inq_dim() fails to fetch associated dimensions. Now, all fields of any types will be converted into netCDF-4 variables of SIMPLE spaces with no exception.

Note that textual attributes still need to be of SCALAR space, and this changelist doesn't affect that part.