Fix #29848: cycles not respecting dupli group visible layers, also exposed DupliObject.hide property in API now.
Fix #29848: cycles not respecting dupli group visible layers, also exposed
DupliObject.hide property in API now.

pyrochlore/cycles,tangent-opensource/coreBlackbird,pyrochlore/cycles,tangent-opensource/coreBlackbird,pyrochlore/cycles,tangent-opensource/coreBlackbird