fix Scigraph accept-values
fix Scigraph accept-values

 * the accepting-values macro hackery appears to return multiple (or
   one) values, not a list that needs to have values-list applied to
   it. With this fix, we can load Scigraph again and the sample
   graphs (graph::make-bar-demo, graph::make-plain-demo, and
   graph::make-sample graph) now work again.

slyrus/mcclim,slyrus/mcclim