* arts-2-1-455

* src/abs_species_tags.{h,cc} (SpeciesTag):

mcia -> mcia_second, Cia() -> CIASecond, CiaDataset ->
CIADataset

* src/cia.{h,cc}

(cia_get_index): Helper to find index in CIA data.

(Extract): Add parameter dataset index. Use index instead of
loop.

* src/m_cia (abs_xsec_per_speciesAddCIA,
* abs_cia_dataReadFromCIA):

Adapt for changed type of abs_cia_data.

* src/nc_io_types.h, src/xml_io_instantiation.h,
* src/xml_io_types.h,
src/workspace.cc, src/nc_io_array_types.cc,
src/xml_io_array_types.cc,
src/groups.cc:

Change type of abs_cia_data to ArrayOfCIARecord.

Remove ArrayOfArrayOfCIARecord as a group and add
ArrayOfCIARecord instead.

git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8126 aaf1aab0-4228-0410-ad68-8dceda47f409
	* arts-2-1-456

	* src/gas_abs_lookup.cc (Extract): Implemented feature requested
	by Jana: Throw a runtime error if one of the reference VMR
	profiles is zero, but abs_vmrs is not. (This means that the lookup
	table was calculated with a reference profile of zero for that
	gas.) Not yet tested, since I don't have a suitable test case.



git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8127 aaf1aab0-4228-0410-ad68-8dceda47f409