2013-08-14  Patrick Eriksson  <patrick.eriksson@chalmers.se>

            * arts-2-1-729

            * doc/uguide/refr_index_theory.tex:
            * doc/uguide/ppath.tex:
            * doc/uguide/rte.tex:
            * doc/uguide/refr_index.tex:
            * controlfiles/artscomponents/transmission/TestTransmission.arts:
            * controlfiles/artscomponents/radiolink/TestRadioOccultation.arts:
            * controlfiles/artscomponents/radiolink/TestRadioLink2.arts:
            * controlfiles/artscomponents/radiolink/TestRadioLink.arts:
            * controlfiles/artscomponents/ppath/TestRefractPlanets.arts:
            * controlfiles/artscomponents/ppath/TestPpath3D.arts:
            * controlfiles/artscomponents/ppath/TestPpath2D.arts:
            * controlfiles/artscomponents/ppath/TestPpath1D.arts:
            * controlfiles/general/agendas.arts:
            * src/ppath.cc:
            * src/m_ppath.cc:
            * src/m_refraction.cc:
            * src/refraction.cc:
            * src/methods.cc:
            * src/agendas.cc:
            * src/workspace.cc: As decided in skype meeting, in all files
            above changed:

            refr_index        -> refr_index_air
            refr_index_group  -> refr_index_air_group
            refr_index_agenda -> refr_index_air_agenda



git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8590 aaf1aab0-4228-0410-ad68-8dceda47f409
* arts-2-1-730

* src/optproperties.{h,cc}:

Add enum ParticleSSDMethod.

Change type of particle_type in SMD from String to ParticleType.

Add methods for mapping ParticleType and ParticleSSDMethod from/to enum
value to/from String.

Add ssd_method member to SMD.

* src/xml_io_compound_types.cc:

Add version attribute to SingleScatteringData. New data is now always
written as version 2.

Save particle_type as String in SingleScatteringData and
ScatteringMetaData. Mapped to/from enum value on read/write.

* src/m_tmatrix.cc:

(scat_data_meta_arrayAddTmatrix): Set smd.ssd_method to T-Matrix.
Use ParticleTypeFromString for particle_type String->enum conversion.

(single_scattering_dataFromTmatrix): Use ParticleTypeFromString.

* controlfiles/artscomponents/tmatrix/TestTMatrixSSD.arts:

Change horiz_al to horizontally_aligned.

Store and load scat_data_meta_array and scat_data_raw.

git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8591 aaf1aab0-4228-0410-ad68-8dceda47f409