per-property pages show any superceded properties.
Fixed backwards-worded comment on supercedes().
TODO: add similar to the superceded property's page. That
is slightly harder to look up.
Adding 'supercedes', 'supercededBy' to per-property page.
TODO: currently the entry e.g. for 'seller' in
http://schema.org/Offer won't list multiple properties that it
replaces. Fixing that (existing) bug will need a minor API change
since supercedes() only returns the first superceded property. The
only case of that is in the sdo-sellerbroker branch, so we'll come
to that afterwards.
Merge branch 'master' into sdo-sellerbroker
Improved display of supercededBy information.
Previous code assumed a property superceded only one other.
Added supercedes_all to the API, and use it in per-type and
per-property pages. Should add caching in future, but the HTML
is cached so proceeding as-is for now.
seller is a suproperty of participant (esp. as we replace 'vendor')