0020440: [CEA 349] P1P0 barycentric interpolators

0020440: [CEA 349] P1P0 barycentric interpolators
"Class InterpolationOptions should have an additional method : setP1P0BaryMethod(bool) that will set the _P1P0_bary_method attribute...An additional protected non virtual method treating string representation of interpolation method will be added:"

+    void setP1P0BaryMethod(bool isP1P0) { _P1P0_bary_method=isP1P0; }
+    bool getP1P0BaryMethod() const { return _P1P0_bary_method; }
+    std::string filterInterpolationMethod(const std::string& meth) const;