petl-developers / petl / 36034197402

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Add callable support to setheader (#721)

## Summary

- allow `setheader()` and `Table.setheader()` to accept a callable
- apply the callable to each field in the existing header
- preserve existing iterable-header behavior, including objects that are
both iterable and callable
- document the callable form and add regression coverage
- fix the existing 1.7.26 changelog heading so warning-as-error
documentation CI passes

Closes #431

## Testing

- `.venv/bin/python -m pytest petl/test/transform/test_headers.py
petl/test/test_method_shadow.py` (61 passed)
- `.venv/bin/python -m pytest --doctest-modules
petl/transform/headers.py` (5 passed)
- `.venv/bin/python -m pytest petl` (658 passed, 18 skipped)
- `sphinx-build -W -b singlehtml -d ../build/doctrees .
../build/singlehtml` (passed)

27 of 28 new or added lines in 2 files covered. (96.43%)

14501 of 15732 relevant lines covered (92.18%)

0.92 hits per line