Allow controling ontology IRI when saving

[jesper-friis]

Description

Allow separating the IRI of the ontology from base_iri when saving using rdflib.

Unfortunately owlready2 doesn't allow to separate the IRI of the ontology from the base_iri (the namespace of the entities in the ontology). In many ontologies, e.g. EMMO, are these not the same.

Further work: Also assign the ontology IRI when loading an ontology.

An even better solution would be to ask Jean-Baptiste to add support for separate ontology iri and base_iri to Owlready2.

Type of change

• [ ] Bug fix.
• [x] New feature.
• [ ] Documentation update.
• [ ] Test update.

Checklist

This checklist can be used as a help for the reviewer.

• [ ] Is the code easy to read and understand?
• [ ] Are comments for humans to read, not computers to disregard?
• [ ] Does a new feature has an accompanying new test (in the CI or unit testing schemes)?
• [ ] Has the documentation been updated as necessary?
• [ ] Does this close the issue?
• [ ] Is the change limited to the issue?
• [ ] Are errors handled for all outcomes?
• [ ] Does the new feature provide new restrictions on dependencies, and if so is this documented?

Comments

[codecov[bot]]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (ada4ea5) 71.30% compared to head (70f6c7b) 71.27%.

Files	Patch %	Lines
ontopy/ontology.py	50.00%	7 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #700 +/- ## ========================================== - Coverage 71.30% 71.27% -0.03% ========================================== Files 16 16 Lines 3394 3405 +11 ========================================== + Hits 2420 2427 +7 - Misses 974 978 +4 ```

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