Restarting local agglomeration inside masterCoarsets processor agglomeration

Summary

Continue agglomeration after master-coarsest processor agglomeration

Details of new models (If applicable)

p
{
    solver          GAMG;
    ..
    smoother        GaussSeidel;

    //- Local agglomeration parameters
    nCellsInCoarsestLevel   1;

    //- Processor-agglomeration parameters
    processorAgglomerator   masterCoarsest;
    //- Indicate that local agglomeration needs to be restarted
    nCellsInMasterLevel     1;
}

Risks

• backwards compatible
• not extensively tested