Merge branch 'issue/face-measure-calculation' into 'develop'

Fix unit normal storage

See merge request !110

src/mesh/MeshData.hpp

@@ -106,7 +106,7 @@ class MeshData : public IMeshData
       parallel_for(
         m_mesh.numberOfFaces(), PUGS_LAMBDA(FaceId face_id) { nl[face_id] = (1. / ll[face_id]) * Nl[face_id]; });
 
-      m_Nl = Nl;
+      m_nl = nl;
     }
   }