fix : remove imsave from preprocessing and tests

8 jobs for development/line-detector in 34 minutes and 57 seconds (queued for 7 minutes and 32 seconds)
Status Name Job ID Coverage
  Build
passed distcheck-linux-clang10-debug #163859

00:15:01

passed distcheck-linux-clang12-debug #163862

00:13:31

passed distcheck-linux-gcc10-debug #163860

00:12:40

passed distcheck-linux-gcc11-debug #163861

00:14:23

manual distcheck-linux-gcc9-debug-asan-ubsan #163858
allowed to fail manual
passed documentation #163863

00:06:48

passed windows-debug #163857
windows manual

00:03:57

 
  Bench
manual distbench-linux-gcc9-release #163864
pylene-benchmarks allowed to fail manual