Update Hector Default Params

[kdorheim]

• So we want to update Hector parameters do we want to do this to CMIP6 multi model mean?
• Would there be any reason to do it to the CMIP5 & CMIP6 multi model mean?
• How do we want to document updating default parameters?
• What parameters do we want to update?
• How do we want to keep track of default parameters for different versions of the model?