Text describing bank post keys for structure:

PostType key:
  A = User account
      UserIndex = True: bank balance.
  B = User loan
  C = Bank deposit
  D = Bank withdraw
  I = Interest posted
  T = Bank transfer: no gold moved through bank.

PostSubType key:
  A = Account balance
  B = Borrowed
  D = Deposit
      PostSubType2 = 1: user investment.
  I = Interest posted
      PostSubType2 = 1: bank interest.
      PostSubType2 = 2: user account interest.
      PostSubType2 = 3: user loan interest.
  P = Payment
      PostSubType2 = 1: loan payment during login.
      PostSubType2 = 2: loan payment from bank account.
      PostSubType2 = 3: loan payment from gold.
      PostSubType2 = 4: loan payment interest from bank.
      PostSubType2 = 5: loan payment interest from gold.
  T = Transfer
      PostSubType2 = 0: gold transfered.
      PostSubType2 = 1: gold charge for transfer.
  W = Withdraw

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