Modification to exception text for consistency

When reporting exceptions for VR refinements not having the right number of dimensions, we have both 1D and 2D arrays that have to be handled (the 2D simply because we're patching around a bug in BAG creation in other software that doesn't use this code that's not following the specification correctly).  The reporting of InvalidVRRefinementDimensions therefore has to be neutral on number of dimensions and report that the number is inconsistent.

api/bag_exceptions.h

@@ -441,7 +441,7 @@ struct BAG_API InvalidVRRefinementDimensions final : virtual std::exception
 {
     const char* what() const noexcept override
     {
-        return "The variable resolution refinement layer is not 1 dimensional.";
+        return "The variable resolution refinement layer is inconsistent with specification.";
     }
 };