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 Job ID Name Coverage
  Test
passed #543519
test_python2_mpi

00:02:01

passed #543517
test_python2_scalar

00:02:05

65.0%
passed #543520
test_python3_mpi

00:02:27

passed #543518
test_python3_scalar

00:01:25

 
  Release
passed #543521
pages

00:00:53

 
  Deploy
passed pages:deploy

00:00:00