Merge branch 'real_fft_really_integrated' into 'master'

Real fft really integrated

See merge request !185
6 jobs for master in 33 minutes and 55 seconds (queued for 1 second)
Status Name Job ID Coverage
  Test
passed test_min #246581

00:04:01

passed test_mpi #246582

00:06:15

passed test_mpi_fftw #246583

00:07:30

passed test_mpi_fftw_hdf5 #246598

00:20:01

64.0%
failed test_mpi_fftw_hdf5 #246584

00:12:37

 
  Release
passed release_image_master #246585

00:06:23