cubicweb #3206129 gen-static-datadir mess with cubicweb.{,old.}css [validation pending]

WebConfiguration.locate_resource rewrites cubicweb.css to cubicweb.old.css, leading gen-static-datadir to create cubicweb.old.css twice in the static datadir, and not cubicweb.css. And since apache doesn't then do the same rewriting madness, things fall over when a css imports cubicweb.css, as in http://hg.logilab.org/master/cubes/intranet/file/fbf9b4747cab/data/cubes.intranet.css

prioritynormal
typebug
done in3.17.10
load0.500
load left0.000
closed by#8ab0e601d418 [web] don't rename resources in gen-static-datadir
patch[web] don't rename resources in gen-static-datadir [applied]