Cuirass frontend

[Danny Milosavljevic]

First version of Cuirass status frontend is attached (renamed from 
"index.html").

It displays, for a given project and jobset, a list of the latest finished 
builds
and the latest queued builds.  It also updates this list from time to time 
(every
minute or so).

For some reason, Cuirass only returns one project and jobset for the "jobsets"
request, so the HTML SELECTs will never contain more than one each :P

I can't find a way to get Cuirass to return a list of failed builds so that's
not supported.

To test it, you need to

(1) put it somewhere on https://berlin.guixsd.org/ in order not to be
"cross" (in this case, "URLPREFIX" can be simplified), or
(2) make Cuirass output special HTTP headers that specify the location
from where the scripting request is okay, or
(3) disable the cross-site scripting protection in icecat (Add-on "CORS
Everywhere").

Requires Javascript.

Project: ; jobset:

Request status:

Finished Builds

Starts with	At least	At least
Packagename	Builds	Latest build finished at

Queued Builds

Starts with	At least	At least
Packagename	Builds	Build most recently enqueued at