message: export constructor for `TxAux`
diff: @@ -646,6 +646,11 @@ pub struct TxAux {
  tx: Tx,
  witnesses: Vec<TxInWitness>,
  }
  +impl TxAux {
  + pub fn new(tx: Tx, witnesses: Vec<TxInWitness>) -> Self {
  + TxAux { tx: tx, witnesses: witnesses }
  + }
  +}
  pub struct TxProof {
  number: u32,
  