Consider changing how broken links across components are handled

Please consider changing/improving how broken links across different components are handled in DNG.

We have a large number of links that span components. When deleting an artifact which has in-links, if both ends of the artifact are in the same component the link is automatically deleted, but if the origination end of the link is in a different component it results in a broken link.

The broken link makes it impossible to publish the originating module using a view that contains the broken link. In that case, DNG returns a 404 error to the /rm/publish request.

Please consider the following suggestions:
1. When deleting an artifact which has in-links from other components, provide a warning message to the user indicating that these in-links exist and will result in broken links, and that the user may want to delete those links from the source artifacts prior to deleting the target artifact. Provide a "cancel" button so they can go delete the links first.

2. Provide a method to filter out broken out-links in a view. Such a capability exists in the "artifact links" pane for the selected artifact (you can deselect "external links" and they go away), but there's no way to do this for the view as a whole.

3. Provide a method for the /rm/publish request to not generate a 404 error if bad links exist. Maybe a "best available" approach would work, or perhaps add it as an option on the /rm/publish request.