FUNCTION NBR2STR()

  Short:
  ------
  NBR2STR() Correctly orders numerics where negative

  Returns:
  --------
  String

  Syntax:
  -------
  NBR2STR(nNumber)

  Description:
  ------------
  Ensure numeric fields are correctly ordered when
  converting to type character and when taking negatives into account.

  This is done by attaching CR, DB or CZ to the end of
  the number to overcome the placement of (-+) in the ASCII scale.

  Examples:
  ---------
   index on LASTNAME+NBR2STR(amount_due) to NEWINDEX

  Source:
  -------
  S_NBR2ST.PRG