System correction to multiplier for calculated total sum

[hugograf]

Which part and what Version?
Version: 0.10.0
[x] Internal structure (user should not notice)
[x] Improvement for the user

The calculated and rounded total should match the non-rounded total as closely as possible. Therefore, the system adjusts the exchange rate or the price per unit. The rounding of the decimal places corresponding to the currency must be taken into account. See also issue #9. Enabling this feature is done via GlobalConstants.AUTO_CORRECT_TO_AMOUNT.