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.

tutorials/compressible/rhoPimpleFoam/RAS/aerofoilNACA0012/system/controlDict

@@ -14,8 +14,6 @@ FoamFile
 }
 // * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
-libs            ("libmodifiedInletOutlet.so");
-
 application     rhoPimpleFoam;
 
 startFrom       latestTime;