Add GPS groupbox to hardware tab.

I propose grouping hardware configurations that are tied to optional module Enable/Disable into groupboxes

For instance:
![Screen Shot 2013-02-27 at 1 32 36 PM](https://f.cloud.github.com/assets/1118185/201062/98642c66-80e3-11e2-9fd0-4e3e312a45bd.png)
![Screen Shot 2013-02-27 at 2 41 39 PM](https://f.cloud.github.com/assets/1118185/201063/9af8fd4e-80e3-11e2-9aba-0e3a3972360f.png)

This cleans up the interface a bit, and is an easy way to allow the user to enable common optional modules without having to go into the UAVO browser.

As a way of extending this, we could create a new tab and put all optional modules there.