Chris Hill-Scott 3d2f7c3fcf Refine error messages and fix tests ...

Removing the word ‘duplicate’ because:
- it suggests that the whole column is the same, which it might not be
- it suggests that having duplicate column names is a problem, which is
  only true in the case of recipient columns

Reverts back to saying the column names ‘need to’ match, because we feel
it’s more instructive.

2019-10-03 14:24:28 +01:00

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