Use 'parent' instead of 'father'

[szhorvat]

The father vector, used by the dfs and bfs functions, should be renamed to parent to line up with standard nomenclature. Doing so will be breaking change, so some mitigation may be necessary.

[szhorvat]

@krlmlr This is an argument renaming, perhaps non-essential for 2.0.0. Do you want to remove it from the upgrade milestone?

[github-actions]

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