Refactored code for zebra striping, clicking on the top bar of the svg area now hides unconnected devices/signals.
  Need to create an object for the overall display. I will branch to that now.
Create listView object and instantiate view as an instance of it in main.js now update_display() is a method of listView.
View initializes properly as its own object.
Put last list view dependent variables inside object.