ellipt demo corrected, to accept expressions in operators

demo/src/ellipt.cc

@@ -45,14 +45,14 @@ int main(int argc, char* argv[])
 
   // ===== create matrix operator =====
   Operator matrixOperator(ellipt.getFeSpace());
-  matrixOperator.addSot(1.0);
+  addSOT(matrixOperator, 1.0);
   ellipt.addMatrixOperator(matrixOperator, 0, 0);
 
   int degree = ellipt.getFeSpace()->getBasisFcts()->getDegree();
 
   // ===== create rhs operator =====
   Operator rhsOperator(ellipt.getFeSpace());
-  rhsOperator.addZot(eval(new F(degree)));
+  addZOT(rhsOperator, eval(new F(degree)));
   ellipt.addVectorOperator(rhsOperator, 0);
 
   // ===== add boundary conditions =====