Add 'edit_head_line' method to D-Stability Waternet

[yida-tao]

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[carloslubbers]

Thanks for your contribution, the added method looks good! Could you add a small test verifying it's behavior in the file tests/models/dstability/test_waternets.py? You can add it right below test_add_head_line in a similar style, assert'ing that your method correctly updates the head line properties

[sonarqubecloud]

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