* arts-2-1-741

* README: Extend section on enabling / disabling Fortran features.

* CMakeLists.txt: Add -Wno-return-type-c-linkage to shut up clang
warning about Complex C++ return type used in C call to refice_. It's
fine.

Remove f2c related code.

* config.h.cmake: Remove f2c cmakedefine.

* src/CMakeLists.txt: Removed test_disort. Now in 3rdparty dir.

* 3rdparty/disort1.2/CMakeLists.txt: Add test_disort.

* 3rdparty/disort1.2/ErrPack.f: DSERRMSG->ERRMSG.

* 3rdparty/refice/REFICE.f: ERRMSG->RERRMSG. Easier to rename it here
than in the Disort code.

* 3rdparty/disort1.2/CMakeLists.txt, 3rdparty/refice/CMakeLists.txt,
3rdparty/tmatrix/CMakeLists.txt:

Simplify. Tweak messages.

* controlfiles/CMakeLists.txt:

Promote tmatrix tests from nocheck to fast.

git-svn-id: https://www.sat.ltu.se/svn/rt/arts/trunk@8612 aaf1aab0-4228-0410-ad68-8dceda47f409