As a user, I want to be able to tell whether a relationship from a group/software/mitigation points to a subtechnique or technique.

We should redo the relationship tables (using a macro to avoid code duplication) to differentiate parent techniques from subtechniques. If a relationship exists with one or more subtechniques under a single parent (but not the parent itself), it should group them under the parent technique but mark the parent technique in such a way to make it obvious that it does not have a relationship (e.g by deemphasizing thet text).