improve/tidy up interfaces widget

Change from using multiple tables to one, which simplifies the code.

Improve the display so the icon (up/down) is in its own TD

Before and After
![widget](https://cloud.githubusercontent.com/assets/4223752/3979929/260ca1ae-285b-11e4-81f0-4563c3a4ab02.png)
 
Please add quotes on class definition