switch all local imports to relative, to avoid silent mistakes

4 jobs for relative_imports in 2 minutes and 46 seconds
Status Name Job ID Coverage
  Test
failed test_minimal #257335

00:00:22

failed test_mpi #257336

00:01:06

failed test_mpi_fftw #257337

00:01:32

failed test_mpi_fftw_hdf5 #257338

00:02:46

 
Name Stage Failure
failed
test_mpi_fftw_hdf5 Test There is an unknown failure, please try again
No job log
failed
test_mpi_fftw Test There is an unknown failure, please try again
No job log
failed
test_mpi Test There is an unknown failure, please try again
No job log
failed
test_minimal Test There is an unknown failure, please try again
No job log