add analysis option to top-level specializations of Conclusion

[thomast73]

In issue #242, we have decided to add an option to include analysis to the proposedEvidenceReference` data type.

In issue #244, we have decided to add an option to include analysis to a SourceDescription.

It would be my understanding that we also need an option to include analysis in one other place [assuming changes proposed in #244 are adopted] — in the top-level specializations of Conclusion, meaning Person, Relationship, Event and PlaceDescription.

I would define this analysis member more or less as follows (what a "conclusion" is called is under discussion on #244):

• Description: A reference to a document containing analysis about this conclusion.
• Data type: URI
• Constraints: OPTIONAL. If provided, MUST resolve to an instance of http://gedcomx.org/v1/Document of type http://gedcomx.org/Analysis.

[stoicflame]

+1

I like.

[stoicflame]

Fixed with #244