refactor: eliminate manual edits from autogenerated files

[szhorvat]

@krlmlr Can we please have this merged now to reduce the pain of having to untangle manual edits to autogenerated files whenever re-running stimulus?

Issues opened:

• Use void for empty argument lists in C stimulus#6

Explanation of changes:

• is_bipartite and realize_bipartite_degree_sequence are new in 0.10.9, hence added due to the C core update
• has_attribute_table and igraph_version were edited to fix a compiler warning, but we don't actually use them, so removed; issue opened in stimulus
• get_subisomorphisms_vf2_callback: the generated R code for this was manually removed, and it's simpler to also remove the generated C code until we actually need it.

Ref: #1176

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[szhorvat]

Update: Second commit eliminates the last remaining manual edit. I'm not even sure if this was a manual edit, or the result of a C-side bugfix in the interface definition.

[krlmlr]

Thanks for fixing the drift! Please add the "mergequeue" label when good.

[krlmlr]

Is this intentional?

[szhorvat]

This bit of code was incorrect, so I intentionally allowed it to be removed by the auto-generation. This code was trying to add vertex names to a vector that contains edge-quantities, not vertex quantities. I also removed a dependence of the result on V(g) in functions-R.yaml for the same reason, although this seemed to have no ill effect.

If you find anything else that looks suspicious, let me know!

[szhorvat]

Also: As far as I can tell, we're not exposing this function at the moment, so this bug did not have any consequences so far.