MoreCast: Rename bias columns

[nealmcloughlin]

Describe the task
There column names for bias corrected weather columns is confusing for weather forecasters. Eg.) Many forecasters assume "RDPS bias" is the difference between the model forecast and observed values. This task is to rename bias corrected columns so they don't cause confusion.

Acceptance Criteria

• Rename all bias corrected columns from MODEL bias to MODEL adjust

Additional context

• Add any other context about the task here.
• Or here

[rajpersram]

The column headers will only show 'model' on the second line ('adjust' gets cut off due to width restrictions). Could we leave out the 'model' and just use 'adjust'? The word model might be fairly redundant.