When in tables, be more careful about links.  First, fix an obvious bug where the linkqsz isn't zeroed after the linkq is flushed.  Second, we can't just check whether the link queue is empty, because --gemini-link-end will accumulate links until the end of the document. So introduce nolinkqsz that, if non-zero, mirrors linkqsz + 1.  This allows us to not accumulate links, but format them as if we were, so that table sizes will allow for arbitrary link references.
When in tables, be more careful about links.  First, fix an obvious bug
where the linkqsz isn't zeroed after the linkq is flushed.  Second, we
can't just check whether the link queue is empty, because
--gemini-link-end will accumulate links until the end of the document.
So introduce nolinkqsz that, if non-zero, mirrors linkqsz + 1.  This
allows us to not accumulate links, but format them as if we were, so
that table sizes will allow for arbitrary link references.

kristapsdz/lowdown,kristapsdz/lowdown,kristapsdz/lowdown