Removal of the scopePath element from the varList argument of addVar, removeVar, removeVarIfUnused, addModuleVar and isVarUsed

[SebastienRietteMTO]

The addVar, removeVar, removeVarIfUnused, addModuleVar and isVarUsed methods use a varList argument whose first element is a scope path.
It would be better (from an object-oriented point of view) to suppress this path and to call these different methods directly on the right scope.

For instance self.addVar([[scope.path, 'I', 'INTEGER :: I', None]]) would become scope.addVar([['I', 'INTEGER :: I', None]]).

This feature can be implemented using the --restrictScope argument defined in scripting.