Improve variable description inline documentation

  dcomplex *dlri;

  //! \brief Vector of dielectric constants.

  dcomplex *dc0;

  //! \brief TBD

  //! \brief Vector of complex refractive indices.

  dcomplex *vkt;

  //! \brief Vector of sizes in units of 2*PI/LAMBDA

  double *vsz;

  // >>> NEEDED BY CLUSTER <<<

  //! \brief Vector of field intensity components.

  dcomplex *vintt;

  //! \brief Total forward scattering amplitude.

  //! \brief Total forward scattering amplitude of the spheres.

  dcomplex tfsas;

  //! \brief Total scattering amplitude.

  //! \brief Total scattering amplitude of the spheres.

  dcomplex **tsas;

  //! \brief Total scattering cross-section.

  //! \brief Sphere scattering cross-section.

  double scs;

  //! \brief Total extinction cross-section.

  //! \brief Sphere extinction cross-section.

  double ecs;

  //! \brief Total absorption cross-section.

  //! \brief Sphere absorption cross-section.

  double acs;

  //! \brief TBD.

  dcomplex **gis;