Check spelling/validity of confirmation file entries.

[cwwalter]

Currently, a misspelled/wrong yaml file entry will just be ignored. This has caused some confusion and mistakes by users during testing.

@rmjarvis told us in a meeting that there is defined a straightforward way to check if entries are proper/well formed.

We should do this if we can.

[rmjarvis]

This is the function that checks that all parameters are valid. It's automatic if using GetAllValues, but we can run it manually if everything is parsed manually.
Here is an example of how to use it in practice.

[cwwalter]

Classes missing parameter check linting now are:

• OpsimDataLoader
• TreeRings
• Checkpointer
• Stamp.py (non-diffraction parts)

We need to convert these to catch input mistakes.

[cwwalter]

Closed by #387.