GAMGAgglomeration: set to be a GeometricMeshObject to ensure it is deleted in AMI cases when the mesh moves

compressibleTwoPhaseEulerFoam, multiphaseEulerFoam and twoPhaseEulerFoam phaseModel: treat slip conditions as special cases and set the corresponding flux to fixedValue 0

compressibleTwoPhaseEulerFoam/alphaEqn.H: Add commented legacy semi-implicit unbounded alpha formulation for reference

All MeshObjects are now handled generically in polyMesh and fvMesh
See MeshObject.H for details

leastSquaresGrad, skewCorrected: with MeshObject there is no need for data to be held on mutable pointers

Add support for constructing VectorSpaces from forms with lower component type,
e.g. Vector<scalar> from Vector<label>

Add support for constructing VectorSpaces from forms with lower component type,
e.g. Vector<scalar> from Vector<label>

Add support for constructing VectorSpaces from forms with lower component type,
e.g. Vector<scalar> from Vector<label>

adding a base class basicSolidChemistryModel and deriving
pyrolysisSolidChemistry  model for solid