Allow control of item order on Build Status page

[mpotter@…]

Allow control of the order of presentation of the build configuration items on the ​Build Status page. In 0.6b2 the order appeared to be sorted by build configuration name. In 0.6b3 the order is sorted by build configuration label. I preferred sorted by name for this allowed me to control the presentation, but this was a bit of a hack.

Possible solution, quoted from ​Walter W. Bell in Bitten Google Groups

Maybe a concrete first proposal is:

• Add a group name to each configuration (defaults to none)
  
• Update the configurations page to show configurations by group (in sorted group order), with a separator between them, with the configurations in a group sorted by label.

[mpotter@…]

Another approach: Add an "Order" control column similar to the Trac Admin page for Priorities, Resolutions, Severities and Ticket-Types. This would have the advantage of consistent UI and potential code re-use.