Adapt to Coq PR #18591: better refolding of addn induces now useless addnE · coq-community/fourcolor@ed11178

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

z'G' is declared opaque (Qed) but this is not fully respected inside

z_barb_z is declared opaque (Qed) but this is not fully respected

clink_at_G' is declared opaque (Qed) but this is not fully respected

clink_at_G is declared opaque (Qed) but this is not fully respected

z_comp_preimage is declared opaque (Qed) but this is not fully

z_barb_comp is declared opaque (Qed) but this is not fully respected

not_cross_edge_Walkup is declared opaque (Qed) but this is not fully

disconnected_cross_edge is declared opaque (Qed) but this is not

not_cross_connected is declared opaque (Qed) but this is not fully

eCedom is declared opaque (Qed) but this is not fully respected

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