revise Laplace operator and add some basic testing

4 jobs for laplace_fixes in 60 minutes and 4 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #248491
test_min

00:03:48

passed #248492
test_mpi

00:06:49

passed #248493
test_mpi_fftw

00:07:32

failed #248494
test_mpi_fftw_hdf5

01:00:04

 
Name Stage Failure
failed
test_mpi_fftw_hdf5 Test There is an unknown failure, please try again
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