This dynamic block will list all items (including their priority) that link to
the item at point or to any of its parent items. The use case for this is to
have a series of periodic appointments where certain topics should be
discussed (“jour fixe”), and where those topics can be referenced in those
appointments via backlinks. However, simple backlinks to an item on a fixed
date is not sufficient here, as there might not be enough time on that day to
discuss all items. To avoid having to manipulate all backlinks that could not
be discussed, one could simply add a reference to the parent item of all
appointments of the jour fixe series. Using the new dynamic block introduced
here, this item will be on the list of open topics until it's closed.