Visualize addressability of ArrayPorts

[bergie]

With ArrayPorts we should, instead of having multiple wires going to a single port, have them each connect to a different port.

So, instead of multiple connections to a in port, you'd have a connection to in[0], another to in[1] etc.

See noflo/noflo-ui#14

[forresto]

Need this for IIPs: https://github.com/bergie/flowcopter/blob/master/graphs/RouteCommands.fbp

[forresto]

This will also help with autolayout sorting of nodes connected to an arrayport.

As a hack for now, @automata do you think if we fake the port position (portY + (arrayportIndex * 0.01)) Klay will sort the upstream nodes better? Eg: (point could be above curve, b/c it is connected to arrayport 0)

[bergie]

@forresto just keep in mind that we have both kinds of connections:

• Multiple connections to/from a regular port
• Multiple connections to/from ArrayPort, by index

[automata]

@forresto now that we have FIXED_POS as default port constraint, I think it can helps.

If we have arrayportIndex in portInfo it is easy to test. I can give it a try.