Merge branch 'line_search' into 'master'

Line search

See merge request !166
5 jobs for master in 13 minutes and 17 seconds
Status Job ID Name Coverage
  Test
passed #225897
test_min

00:02:54

passed #225898
test_mpi

00:04:40

passed #225899
test_mpi_fftw

00:05:12

passed #225900
test_mpi_fftw_hdf5

00:06:25

65.0%
 
  Release
passed #225901
release_image_master

00:06:52