Directed edges

[lizmcconnell]

From focus group on July 7, 2017: Would like an option to generate directed edges. This could be a configural option in the Architect where if "directional" is turned on, arrows would show up on edges. Likely the first node you click is "from" and the second is "to." @michellebee

[jthrilly]

Further discussion indicated that this is still a desired feature, although there is disagreement about the nature of the implementation.

At the very least, we need to avoid assuming that ties are symmetrical in our internal application logic.

Currently, we make this assumption in the sociogram when linking nodes. This will be revised when we implement directed edge creation.

Directed edges will be specified as a top level property of the interview protocol.

Relevant implementation issues:

• Implement "directedEdges" protocol property (#477)
• Add directed edge creation support to sociogram (#478)