feature suggestion: auto port of node by double click

[boyangzhao]

Hi, with the rabix desktop, we have to manually drag out from a tool/subworkflow to port an input or output. With many ports, dragging it some can be very cumbersome, especially the porting has a 'stickiness' to it that it would attach itself to a nearby node, instead of creating a new node. It would be a really useful feature if the user can just double click on the port of a tool/subworkflow and it would automatically port it out to an independent node without having to drag it out to somewhere far apart from other nodes.