Pinboard phase 2

**READY FOR MERGE**

Finish up tasks with the pinboard and job details panel.

* you can delete bug associations
* center panel of job details resizes with window
* failure classifications are fetched from the server refdata, rather than hard-coded in the ui
* you can pin all shown jobs in the global filter panel
* code cleanup of some dead code
* filtering fix for ``failure_classification_id`` of null vs. 1 where 1 is "not classified"  Handles both as "not classified"
* fix for filter panel unchecking unclassified, then rechecking it shows no jobs.
* colorize the bottom-left panel based on the result of the job