make code more readable

4 jobs for vl_bfgs in 6 minutes and 35 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #200547
test_min

00:03:27

passed #200548
test_mpi

00:04:59

passed #200549
test_mpi_fftw

00:05:22

passed #200550
test_mpi_fftw_hdf5

00:06:34

68.0%