Visual depicting of VIC schema is incomplete

[wxwilcke]

The readme and documentation refers to a visual depiction of the CIV schema on several accounts, and implies that this picture gives a complete overview of the schema. However, there are quite many classes and properties omitted from this image that are defined in the CIV schema. Granted, not all of these are equally important and might clutter the visual depiction, yet there are still several that are missing that I feel are rather important, and which are, in fact, used in some of the published datasets, e.g.:

• civ:Divorce
• civ:childOf
• civ:occupation
• schema:birthDate
• schema:deathDate

Since the image will likely be the starting point for many new users, I suggest to update it with the most relevant classes and properties, or to make it very clear that this image only depicts a subset of the entire schema.

[coret]

It might be also usefull to describe if these classes and properties are used in the current tool (or are on the todo-list).