Hotfix/cmake find mpi
Changed a couple of lines in main.sh to detect MPI generically, which is why it should've been done before in main.sh. Also, bumped CMake to 3.11 as this is required to use FetchContent (for Google Tests)
Changed a couple of lines in main.sh to detect MPI generically, which is why it should've been done before in main.sh. Also, bumped CMake to 3.11 as this is required to use FetchContent (for Google Tests)