SEC-10 - Class CreditworthinessSelection defined as equivalentClass of a rdfs:Datatype

[ElisaKendall]

Signed-off-by: Elisa Kendall ekendall@thematix.com

Description

1. Eliminated some redundant properties from the CDOs ontology (not all), and
2. Eliminated the notion of 'creditworthiness' and 'creditworthiness selection' in favor of 'credit quality' and a number of named individuals representing various terms for credit quality that are widely used (and were previously included in the datatype that was called 'creditworthiness selection'), and moved these concepts to CreditRatings given that they apply more broadly

Fixes: #1786 / SEC-10

Checklist:

• [x] I'm familiar with the FIBO developer quide. My contribution meets all the requirements described there.
• [x] My contribution follows the principles of best practices for FIBO.
• [x] My changes have been reconciled with latest master and no merge conflicts remain.
• [x] This PR is related to exactly one issue. The issue is referenced by using a GitHub keyword such as "fixes", "closes", or "resolves".
• [x] Hygiene tests have been applied by a PR with "(WIP)" in title.
• [x] The issue has been tested locally using a reasoner (for ontology changes).