* arts-2-1-670

* controlfiles/artscomponents/absorption/TestAbsDoppler.arts,
controlfiles/artscomponents/absorption/TestCompareArtscat3And4.arts,
src/m_abs.cc (WriteMolTau), src/m_abs_lookup.cc (abs_mat_fieldCalc),
src/workspace.cc, src/methods.cc:

Rename abs_mat_field and abs_mat_fieldCalc to propmat_clearsky_field
and propmat_clearsky_fieldCalc.

* src/m_abs_lookup.cc (propmat_clearsky_fieldCalc):

Add mag_*_field as input. Add checks for magnetic field.
Add los Vector as generic input.

git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8489 aaf1aab0-4228-0410-ad68-8dceda47f409