Duplicate "original" links aren't removed
This issue contains a bugfix for the reindexation in Firefox.
Let's assume the following scenario:
A requirement is removed from a page,
But for some reason the indexation isn't triggered (the plugin was uninstalled while the requirement removal happened, etc),
Then AOLink with type=ORIGINAL wasn't removed.
In this situation, a user would be told the requirement has a duplicate definition, with a link to a page where the they can't remove the requirement (because it was already removed).
This issue will be resolved in 1.13.8, but may reappear in 1.14. Please test for it explicitly.