message: Add common traits to {Traversal,Iteration}Order
diff: @@ -215,6 +215,7 @@ impl Group {
  }
  }
  +#[derive(Clone, Copy, Debug, PartialEq, Eq)]
  pub enum TraversalOrder {
  Lexicographic,
  Creation,
  @@ -230,6 +231,7 @@ impl From<TraversalOrder> for H5_index_t {
  }
  }
  +#[derive(Clone, Copy, Debug, PartialEq, Eq)]
  pub enum IterationOrder {
  Increasing,
  Decreasing,
  