Re: Implement new handling for \paper margin settings.

[Michael Käppler]

Hi Carl,
> LGTM.  I do have one comment about tests for != SCM_UNDEFINED.  It think
> there's less chance of confusion when testing for "undefined" rather
> than "not undefined", which is "defined".  The double negative (not
> undefined) can potentially be confusing.
that's a good point. However, I'm going to be on vacation for a week and 
will rewrite this when I come back.

Regards,
Michael