Improve update of columns

[one-data-cookie]

When pushing columns to Superset, it was previously unclear which of the fields can cause errors in PUT calls. To remedy that, we chose a static list of fields to include when pushing the information back.

Now, Superset allows you to just pass id and column_name as unique column identifiers and whatever is not listed stays untouched. This is now reflected in the code whilst passing only description with it to be updated.

[one-data-cookie]

Thanks again! Any additional thoughts, @sweco? 🙂

[one-data-cookie]

Thank you, @sweco! Merging. 🙂