move arithmetic functions working on Fields to sugar

3 jobs for static_restructure in 3 minutes and 59 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build Docker
passed #558952
build_docker_from_cache

00:00:15

 
  Test
passed #558953
test_python2_with_coverage

00:03:41

77.0%
passed #558954
test_python3

00:03:43