FEAT: added check for existence of namespace(s) provided as argument to WITH FEAT: a compilation warning is now raised if WITH namespaces share one or several identical variable names.
FEAT: added check for existence of namespace(s) provided as argument to WITH
FEAT: a compilation warning is now raised if WITH namespaces share one or several identical variable names.

NikolayShubenkovProgSchool/red,rheber/red,NikolayShubenkovProgSchool/red,iArnold/red,rheber/red,vehar/red,vehar/red,red-eco/red,iArnold/red,red-eco/red