chore: use "parent" instead of "father" in bfs() and dfs()

[maelle]

Fix #880

It's not breaking anything as the functions still also return the "father" field.

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[szhorvat]

This just renames father to parent, right? I don't think my review is needed here (I wanted to do this for a long time).

[maelle]

This way you saw it's not even a breaking change 😸

[krlmlr]

Thanks!

[krlmlr]

Running checks now.

[maelle]

mhahsler/pomdp#18

[krlmlr]

@Antonov548: can you please resolve the merge conflicts in src/rin*.c ?

[krlmlr]

Resolved conflicts.

[maelle]

I quickly "resolved the conflict" with the goal to then really fix it by running tests locally.

Now I cannot load the package any more?!

[krlmlr]

Do you need git clean -fdx src ?

[maelle]

I think we could merge this.

[krlmlr]

Great, thanks!

[maelle]

I guess we can merge?

[krlmlr]

Thanks!