Use NOTBUILT rather than GREY when a job has not yet been built

Before this patch, the tool tip for the grey ball next to a newly created job with no builds would show _Pending_, which seems odd. Now it will show _Not built_ which seems more intuitive.

Technically a change to the remote API, which exposes ball color (though never with a documented meaning). I checked that at least the NetBeans client is not harmed.