RelatedProjectsConverter never rendered calculated links

It always rendered RelatedProjectsExt#getRelatedProjects() even
if the "calculated" flag was set. Furthermore, the "calculated"
flag was never rendered. It now has been changed to render as
boolean flag as the v2 writer does.

Change-Id: I1ac086efb65483e4b49b278bea8c7dc04dabc317
Signed-off-by: Michael Ochmann <michael.ochmann@sap.com>