NOT_BUILT & other build status are reported inconsistently

If a build terminates with a NOT_BUILT status it is not reported correctly in a number of places:

• The tooltip for the grey ball is "Pending" when it should be "Not built".
• The rss/atom build result feeds report status as "?"
• Matrix build tooltip reports a pending/queued build as "skipped"
• The parent matrix build console output does not record the build status for each job. That is useful to get a quick feel for the status of each job and order of execution/completion.
• NOT_BUILT can be returned as a previous build result when calculating unstable/back to normal build notifications