Get parents recursively

Summary

Entity.get_parents_recursively() did not work for unretrieved parents. Does work now. See #159 (closed).

Focus

• Does this solve the issue?
• Is the wrapped-entity mangling the correct way? (If not, how could tests against this look like?)

Test Environment

See pyinttests: pytest-3 -k recurs or pytest-3 tests/test_recursive_parents.py

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• All automated tests pass
• Reference related issues
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• Appropriate user and developer documentation (or not necessary)
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• Annotations in code (Gitlab comments)
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Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
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assigned to @daniel

marked the checklist item Annotations in code (Gitlab comments) as completed

mentioned in issue #159 (closed)

marked the checklist item All automated tests pass as completed

requested review from @henrik

added 5 commits

• 30595fec - MAINT: use list instead of _Parents
• 89b28858 - MAINT: rename _Parents to _ParentList
• 604b9fc7 - DOC: document _wrap a bit
• fb7019ce - MAINT: use another var to make code clearer
• e7a143cc - DOC: add code style comments

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added 1 commit

• 68dbfcc1 - MAINT: added code comment

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resolved all threads

mentioned in commit 78f54773

merged