This patch adds another row to the Status pages that cross-references
the Github issue. It also ensures that the synchronization script takes
that new row into account.
This should make it easier to find out about the detailed status of a
paper from the status pages by clicking on the link and being taken
directly to its associated Github issue. I expect that this should
remove the need for many "Notes" which simply duplicate the information
of which parts of a paper are implemented: instead we can list that the
implementation is partial and users can click on the Github issue to see
what's implemented.
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