Merge branch 'feature/root-benchmark-coupled-kernel' into 'master'

test/multidomain/embedded/1d3d/CMakeLists.txt

...tidomain/embedded/1d3d/root_soil_benchmark/CMakeLists.txt

...main/embedded/1d3d/root_soil_benchmark/couplingmanager.hh

...bedded/1d3d/root_soil_benchmark/couplingreconstruction.hh

...domain/embedded/1d3d/root_soil_benchmark/dap8_rootsys.dgf

test/multidomain/embedded/1d3d/root_soil_benchmark/main.cc

...ultidomain/embedded/1d3d/root_soil_benchmark/params.input

test/multidomain/embedded/1d3d/root_soil_benchmark/plot.hh

...idomain/embedded/1d3d/root_soil_benchmark/problem_root.hh

...idomain/embedded/1d3d/root_soil_benchmark/problem_soil.hh

...ltidomain/embedded/1d3d/root_soil_benchmark/properties.hh

...n/embedded/1d3d/root_soil_benchmark/spatialparams_root.hh

...n/embedded/1d3d/root_soil_benchmark/spatialparams_soil.hh

...rences/test_root_soil_benchmark_kernel_c12a-reference.dat

...rences/test_root_soil_benchmark_kernel_c12b-reference.dat