Network: disabling/enabling devices is now working.

* Disabled the "renegotiate" button for now -- this will move to the
interface add-ons, at least some day.

Network: integrated former hardware view from add-on.

* The interfaces logic is within the main application, so is the
new interface view.
* Disabling/renegotiating does not work yet.
* Reveals a

Network: integrated former hardware view from add-on.

* The interfaces logic is within the main application, so is the
new interface view.
* Disabling/renegotiating does not work yet.
* Reveals a bug in some interface code; when you click on an ethernet
device first, there is no place for the wireless menu. When you then
press on a wireless device, it crashes in BMenuField code.
In the other direction, there is then an empty space.
* Fixed list item width reporting.

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