0019923: EDF 765 SMESH : default values of hypothesis

0019923: EDF 765 SMESH : default values of hypothesis
+   * \brief Initialize my parameter values by linear size of mesh element.
+   *  \retval bool - true if parameter values have been successfully defined
+   */
+  virtual bool SetParametersByElementSize(double elemLenght, const SMESH_Mesh* theMesh=0)=0;