* arts-2-1-841

	* src/m_checked.cc (atmfields_checkedCalc): Be a bit more helpful in
	abs_f_interp_order-in-case-of-wind error message (you have to set it >0
	even if absLUT are not used).

	* controlfiles/general/general.arts:
	Downgrade the do-only-modify-when-you-know message on abs_f_interp_order
	as user HAS to change it if wind is to be used.



git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8803 aaf1aab0-4228-0410-ad68-8dceda47f409
* arts-2-1-842

* src/m_lineshapes.cc:  Added "Hui_etal_1978", implementation by
Rosenkranz.  This is based on a classic paper from 1978 referenced in
the function's meta data.  This function is most likely faster than
the Faddeeva algorithm but might or might not fall apart for some input.
This is not thouroughly tested by me. The function was added
to minimize differences between RTTOV and ARTS.

* src/controlfiles/artscomponents/zeeman/TestZeeman.arts,
controlfiles/artscomponents/linemixing/TestLineMixingAndZeeman.arts:
Modified to also use the "Hui_etal_1978" line shape. (Note that I did 
not have to change the reference file!).



git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8804 aaf1aab0-4228-0410-ad68-8dceda47f409
Fixed unsaved spelling mistake...


git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8805 aaf1aab0-4228-0410-ad68-8dceda47f409