Files
hyperfine/src
willcl-ark 44c0cc231b expose HYPERFINE_ITERATION to intermediate commands
Fixes: #781

Expose the `$HYPERFINE_ITERATION` variable to intermediate commands.
This will allow iteration-specific prepare/conclude, such as:

```bash
hyperfine --runs 5 --prepare 'echo touch file${HYPERFINE_ITERATION}.dat' \
    'echo testing file${HYPERFINE_ITERATION}.dat' \
    --conclude 'echo rm file${HYPERFINE_ITERATION}.dat' --show-output
```
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