Network: made the revert button (somewhat) work.

* DNS add-on does not yet support it, the rest does.
* However, there seems to be some problems with the net_server when
changing interfaces -- not

Network: made the revert button (somewhat) work.

* DNS add-on does not yet support it, the rest does.
* However, there seems to be some problems with the net_server when
changing interfaces -- not just with revert.

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Network: telnet and ftp are now using ServiceListItem, too.

Network: added telnet and ftp service add-ons.

* They're old, but we still have them on our image.