Rework ontology import

[coveralls]

Pull Request Test Coverage Report for Build 5709622229

• 415 of 476 (87.18%) changed or added relevant lines in 5 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage increased (+9.9%) to 44.982%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/osw/auth.py	29	35	82.86%
src/osw/core.py	33	39	84.62%
src/osw/utils/wiki.py	26	35	74.29%
src/osw/ontology.py	323	363	88.98%
<!--	Total:	415	476	87.18%	-->

Files with Coverage Reduction	New Missed Lines	%
src/osw/auth.py	1	84.92%
<!--	Total:	1		-->

Totals
Change from base Build 5630716296:	9.9%
Covered Lines:	1617
Relevant Lines:	3009

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💛 - Coveralls