message: Fix a bug in the boudary projection methods in ParGridFunction.
  Specifically, in class ParGridFunction, in the methods
  ProjectBdrCoefficient and ProjectBdrCoefficientTangent, add missing
  average computation in the case of a nonconforming mesh.
diff: @@ -425,6 +425,7 @@ void ParGridFunction::ProjectBdrCoefficient(
  {
  // FIXME: same as the conforming case after 'cut-mesh-groups-dev-*' is
  // merged?
  + ComputeMeans(ARITHMETIC, values_counter);
  }
  #ifdef MFEM_DEBUG
  Array<int> ess_vdofs_marker;
  @@ -468,6 +469,7 @@ void ParGridFunction::ProjectBdrCoefficientTangent(VectorCoefficient &vcoeff,
  {
  // FIXME: same as the conforming case after 'cut-mesh-groups-dev-*' is
  // merged?
  + ComputeMeans(ARITHMETIC, values_counter);
  }
  #ifdef MFEM_DEBUG
  Array<int> ess_vdofs_marker;
  