Signature:

    void patchInternalField(UList<Type>& pfld) const;
    // OLD: void patchInternalField(Field<Type>& pfld) const;

    This change is necessary to allow collection into slices of a
    larger list.

ENH: add {fa,fv}PatchField::patchNeighbourField(UList<Type>&)

- a retrieval version similar to patchInternalField(...)

STYLE: adjust AMI patch field private method names

- rename private method

      patchNeighbourField(...) -> getNeighbourField(...)

  to avoid access clashes with public methods

- remove undefined method neighbourSideField()