Navigation reflects resource-only topics

[drmacro]

Using the test documents in the dita-community project org.dita-community.indirectortopic.doctypes, the topics that are linked as resource-only topics are included in the navigation ToC and in prev/next links. They should not be.

I think the issue is with the relationship table, which is relating resource-only topics to non-resource-only topics. This is not something you would normally do, but the result should be that the resource-only topics are not included in navigation (and the links should not be instantiated).

[drmacro]

It seems to be a bit more subtle than I thought. The topicrefs in the reltable are not resource only, which is correct, but the keys they refer to are resource-only topics, so the end result should still be that the topic is not included in navigation.

[blefort-uo]

Related to #26