Changeset 596 for trunk/LMDZ.GENERIC/deftank

• Added double gray case (if graybody=true in callphys.def):
  • opacities are set to a constant value in sugas_corrk.
  • the values are kappa_IR m^{2/kg in the infrared (to be read in callphys.def)}

kappa_VI m^{2/kg in the visible (to be read in callphys.def)}

• Cleaned continuum part in optc*
• Added .def files for a typical 1d earth case in deftank (dry case for the moment)