index_spacing attribute
index_spacing attribute

Previously, we always applied spaces after commas of the indexes of
multidimensional vectors.  However, this seems to make them unreadable
by certain NAG Fortran compilers.

This patch adds the `index_spacing` property, which conditionally
applies these spaces after the commas.  The default behaviour is still
to apply spaces, but it can now be turned off.

Thanks to GitHub user @gitporst for reporting this issue.

marshallward/f90nml,marshallward/f90nml