Residuals: New MeshObject class to store solver performance residuals

This is more efficient and modular than the previous approach of storing the
residuals in the mesh data dictionary.

applications/test/volField/Test-volField.C

@@ -2,7 +2,7 @@
   =========                 |
   \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
    \\    /   O peration     | Website:  https://openfoam.org
-    \\  /    A nd           | Copyright (C) 2011-2018 OpenFOAM Foundation
+    \\  /    A nd           | Copyright (C) 2011-2019 OpenFOAM Foundation
      \\/     M anipulation  |
 -------------------------------------------------------------------------------
 License
@@ -112,10 +112,6 @@ int main(int argc, char *argv[])
         << "Detailed SolverPerformance<symmTensor>: " << nl
         << "  " << sP << endl;
 
-    Info<< nl
-        << "solverPerformanceDict: "
-        << mesh.solverPerformanceDict() << endl;
-
     return 0;
 }