Allow including non-mapped fields in data load success/fail files

[paustint]

Describe the problem you are trying to solve

User Feedback:

I was wondering if you could include all of the non-mapped fields when providing success/fail files after import. This is standard practice among all dataloaders and is very helpful to run multiple data loads.

Additional request:

When using Load Records, is it possible to have the results file include all the columns from the source spreadsheet and not just the ones mapped/imported?