message: Update TAA-related transaction codes
diff: pub const NODE: &str = "0";
  pub const NYM: &str = "1";
  pub const GET_TXN: &str = "3";
  +pub const TXN_AUTHR_AGRMT: &str = "4"; // TODO Use nonabbreviated names as in updated design
  +pub const TXN_AUTHR_AGRMT_AML: &str = "5";
  +pub const GET_TXN_AUTHR_AGRMT: &str = "6";
  +pub const GET_TXN_AUTHR_AGRMT_AML: &str = "7";
  pub const ATTRIB: &str = "100";
  pub const SCHEMA: &str = "101";
  pub const CRED_DEF: &str = "102";
  @@ -19,10 +23,6 @@ pub const GET_REVOC_REG_DELTA: &str = "117";
  pub const GET_VALIDATOR_INFO: &str = "119";
  pub const AUTH_RULE: &str = "120";
  pub const GET_AUTH_RULE: &str = "121";
  -pub const TXN_AUTHR_AGRMT: &str = "122";
  -pub const GET_TXN_AUTHR_AGRMT: &str = "123";
  -pub const TXN_AUTHR_AGRMT_AML: &str = "124";
  -pub const GET_TXN_AUTHR_AGRMT_AML: &str = "125";
  pub const GET_DDO: &str = "120";//TODO change number
  pub const REQUESTS: [&str; 21] = [NODE, NYM, GET_TXN, ATTRIB, SCHEMA, CRED_DEF, GET_ATTR, GET_NYM, GET_SCHEMA,
  