Enable nodes to be disconnected by double-clicking on connected node#, similar to double-clicking to connect from favorites

[wd5m]

A simple enhancement request. I modifed js/main.js as follows:

tablehtml += '<td id="' + id + '" class="nodeNum" onClick="setNodeBox(' + nodeNum + ')" onDblClick="disconnectNode();">' +

David McAnally, WD5M