Minor updates on existing sector divisions

[l-emele]

Description of the issue

@han-f and I reviewed the existing sector divisions and propose the following small improvements:

• Make MMR sector division an instance of EU emission sector division: The MMR sector division is an EU emission sector division defined in Annex XII, Table 1 of Commission Implementing Regulation (EU) 749/2014. It uses CRF sectors (IPCC 2006) and adds further sectors. Further add the axiom 'MMR sector division' 'is used by' 'EU climate policy' to make it an inferred subclass of CRF-based sector division.
• Make EU emission sector division a subclass of EU legislation sector division: An EU emission sector division is an EU legislation sector division that is used in the EU climate policy.

Ideas of solution

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Workflow checklist

• [ ] I discussed the issue with someone else than me before working on a solution
• [ ] I already read the latest version of the workflow for this repository
• [ ] The goal of this ontology is clear to me

I am aware that

• [ ] every entry in the ontology should have a definition
• [ ] classes should arise from concepts rather than from words