Merge branch 'fix_refs_in_doc' into 'NIFTy_4'

replace makro artifact in references

See merge request ift/NIFTy!276
4 jobs for NIFTy_4 in 4 minutes and 32 seconds (queued for 1 second)
Status Job ID Name Coverage
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failed #695211
build_docker_from_scratch

00:04:32

 
  Test
skipped #695212
test_python2_with_coverage
skipped #695213
test_python3
 
  Release
skipped #695214
pages
 
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build_docker_from_scratch Build Docker
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