Expose `if final copy` switch to the user

In some cases, some information in the text should be redacted in the review copy but present in the final copy. It would be nice to have to have a switch you could use in the LaTeX source so you could write both variants without worrying that you will forget to change the redacted text for the camera-ready version. Something like:

```LaTeX
The authors asked colleagues from \iffinal{AFFILIATION}{[redacted for review copy]} for review of the results.
```

It is relevant information in the context of the publication that a human review was done by colleagues of the authors, but revealing the affiliation would compromise the anonymity of the submission.