Documentation

[tingerrr]

A lot of things are only partially documented:

• the test set language is unfinished and only has a single example
• the folder structure of tests is not documented anywhere
• the kinds of tests which are supported and how they interact with various cli arguments
• test annotations
• the meaning of cli test comparison parameters (max-deviation and max-delta)
• the additional testing utilities provided to test scripts

All of these and more need to be crystal clear and well explained before a release is possible.