Ignore duplicates that have different manual (editable) fields (optional)

During my holidays I got a lot of duplicates. Even though I set a different custom label on each new transaction, the duplicates section was displaying transactions that I was sure were different as duplicates.

Since I set myself the custom label, this should be taken into account.

This MR fixes it by ignoring duplicates which have different manual (editable) fields.

Of course a human error is still possible, so this behavior can be disabled through the default parameters.