Add axioms to the tasks module

[madbkr]

Description of the issue

As discussed with @stap-m we are still missing a relation between the action specifications of the subtasks and any of the other concepts of the new module. It was agreed on to have a has part relation to the methodology when first modeling but we were unsure about the exact axiom (should subtasks be in an OR or an AND relationship?).

So far we agreed that OR seems to fit the original description of the issue #1891 best.

Ideas of solution

Add the missing axioms to all the methodologies.

Workflow checklist

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

I am aware that

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