Merge branch 'new_fft' into 'NIFTy_5'

Adjust to new pocketfft interface

See merge request !329
11 jobs for NIFTy_5 in 20 minutes and 21 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build Docker
passed #881762
build_docker_from_scratch

00:11:33

 
  Test
passed #881764
test_mpi

00:04:18

passed #881763
test_serial

00:04:48

80.0%
 
  Release
passed #881765
pages

00:00:58

 
  Demo Runs
passed #881770
run_bernoulli

00:00:35

passed #881771
run_curve_fitting

00:00:33

passed #881767
run_getting_started_1

00:00:32

passed #881768
run_getting_started_2

00:01:18

passed #881769
run_getting_started_3

00:03:00

passed #881766
run_ipynb

00:01:24

 
  Deploy
passed pages:deploy

00:00:01