remove ift.abs(Field); the builtin 'abs' does the trick just fine

6 jobs for NIFTy_4 in 3 minutes and 20 seconds (queued for 2 seconds)
Status Name Job ID Coverage
  Test
passed test_python2_mpi #543519

00:02:01

passed test_python2_scalar #543517

00:02:05

65.0%
passed test_python3_mpi #543520

00:02:27

passed test_python3_scalar #543518

00:01:25

 
  Release
passed pages #543521

00:00:53

 
  Deploy
passed pages:deploy

00:00:00