* arts-2-1-712

* src/m_physics.cc, src/methods.cc:

Add WSM ParticleRefractiveIndexIceWarren84.

* 3rdparty/refice, 3rdparty/CMakeLists.txt, CMakeLists.txt,
src/CMakeLists.txt, config.h.cmake, src/main.cc, src/physics_funcs.h:

Add REFICE fortran routine.

git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8558 aaf1aab0-4228-0410-ad68-8dceda47f409