message: Multiply MAX_PAYMENT by x5.
  This should give more room for custom payment codes. Multiplier was
  choosen as agreed with eco team.
diff: @@ -94,7 +94,7 @@ use crate::{
  pub const CONV_RATE: u64 = 1;
  lazy_static! {
  - pub static ref MAX_PAYMENT: U512 = U512::from(550_000_000 * CONV_RATE);
  + pub static ref MAX_PAYMENT: U512 = U512::from(2_500_000_000 * CONV_RATE);
  }
  pub const SYSTEM_ACCOUNT_ADDR: AccountHash = AccountHash::new([0u8; 32]);
  @@ -1690,6 +1690,7 @@ where
  };
  debug!("Payment result: {:?}", payment_result);
  + eprintln!("payment_gas_cost: {}", payment_result.cost());
  let payment_result_cost = payment_result.cost();
  // payment_code_spec_3: fork based upon payment purse balance and cost of
  @@ -1848,7 +1849,7 @@ where
  )
  };
  debug!("Session result: {:?}", session_result);
  -
  + eprintln!("session_gas_cost: {}", session_result.cost());
  // Create + persist deploy info.
  {
  let transfers = session_result.transfers();
  