Rights check on PartialUpdateCorpus

Closes #1103 (closed)

• Added rights information in the API description
• Renamed all tests to distinguish them from the (missing) UpdateCorpus tests
• Merged two minimum role tests into one with subtests
• Added a test for a 404 error when the corpus does not exist

requested review from @babadie

assigned to @erwanrouchet

mentioned in merge request !1778 (merged)

please rebase @erwanrouchet

added 17 commits

• 85036143...cb8d16be - 16 commits from branch master
• 8db371e7 - Rights check on PartialUpdateCorpus

Compare with previous version

enabled an automatic merge when the pipeline for 8db371e7 succeeds

mentioned in commit f8029454

merged