Modified CMakeLists to compile with PETSc

23 jobs for istotz/Convection in 18 minutes and 20 seconds (queued for 2 seconds)
latest
Name Stage Failure
failed
clang_10.0_mpionly_eigen_petsc_trilinos Pretest
hyteg                    = 704.53 sec*proc (232 tests)

Total Test time (real) = 717.26 sec

The following tests FAILED:
95 - P1SurrogateOperatorTest (Failed)
Errors while running CTest
Cleaning up file based variables
ERROR: Job failed: exit code 1
failed
gcc_10_mpionly_dbg_sp Pretest
[100%] Linking CXX executable Benchmark_03_BlendedAdvection
[100%] Linking CXX executable Benchmark_05_PipeScaling
[100%] Built target Benchmark_04_BlendedAdvectionDiffusion
[100%] Built target Benchmark_03_BlendedAdvection
[100%] Built target Benchmark_02_SwirlingAdvection
[100%] Built target Benchmark_05_PipeScaling
make: *** [Makefile:141: all] Error 2
Cleaning up file based variables
ERROR: Job failed: exit code 1