Function normalise

examples/conway.rs:9–11

(a: &Array<f32>)

}

fn normalise(a: &Array<f32>) -> Array<f32> {
    a / (max_all(&abs(a)).0 as f32)
}

fn conways_game_of_life() {
    let h_kernel = [1.0, 1.0, 1.0, 1.0, 0.0, 1.0, 1.0, 1.0, 1.0];