Variable naming: *_name or *_key?

[yngve-sk]

• ParameterConfig has attribute name
• ResponseConfig also has attribute name
• In datasets we call the columns name
• Older datasets (_measured_data.py) use *_key
• In datasets we use obs_name / response_name
• Various other places in the code we use a mix between _key and _name

We should pick one and just stick to it. Potentially lock down one future use, but doing a rename of all variables might be a more smooth way to "enforce" this.

1. (Not breaking) All variable names could be changed
2. (Breaking) Configs
3. (Breaking) Datasets

[dafeda]

I vote for key because it is used when joining.

[yngve-sk]

I just want it to be consistent, key is a bit more database like, so key sounds good to me