Added output of coarse grid unknowns in MC app.

23 jobs for kohl/convection in 113 minutes and 4 seconds (queued for 2 seconds)
Name Stage Failure
gcc_11_mpionly_dbg_eigen_petsc-complex_trilinos Test
[100%] Linking CXX executable Benchmark_02_Y-Pipe
[100%] Built target Benchmark_03_BlendedAdvection
[100%] Built target Benchmark_04_BlendedAdvectionDiffusion
[100%] Built target Scaling_Workshop_01_Cube
[100%] Built target Benchmark_01_Cube
[100%] Built target Scaling_Workshop_02_Spherical_Shell
[100%] Built target Benchmark_02_Y-Pipe
make: *** [Makefile:141: all] Error 2
Cleaning up file based variables
ERROR: Job failed: exit code 1