Grouped ports connection

[https://www.google.com/accounts/o8/id?id=aitoawmazmxfhpyaklskeqvmnmzj08_mnyn1lpy]

One user expressed wishment for stereo-pairs support by ladish. Of course, ladish can't do it, otherwise it will make it less universal.

Currently one way of grouped connection is known on example of patchage: select ports on both sides, than press Enter.

Also there are could be more ways:
1. Select ports only on one side, that just drag them (in this case several wires should be dragged). If target is client, connections should fill all ports begining with first. If target is port, filling should begin from this port.
2. Same as before, but dragging source is either client itself (dragging should be made with some control key (shift)), or special group port, which could be dragging instead of all ports. Anyway, in both cases effect is the same as in 1.

[http://nedko.arnaudov.name/]

In short term we should port some functionailty from patchage. In long term I want stereo connections to be presented as single line.