Merge branch 'minor_changes' into 'master'

Minor changes in Field class

See merge request !124
5 jobs for master in 14 minutes and 2 seconds (queued for 12 seconds)
Status Job ID Name Coverage
  Test
passed #166291
test_min

00:02:37

passed #166292
test_mpi

00:04:24

passed #166293
test_mpi_fftw

00:04:54

passed #166294
test_mpi_fftw_hdf5

00:05:46

57.0%
 
  Release
passed #166295
release_image_master

00:07:28