Account Calculation; added extra "User" fields to Interest audit information

Extra "User" fields have been added to the Account Calculation Interest audit information. This allows better auditing when a custom script is used to calculate Interest.

The additional information stored is:

AccountCalcDays.UserData, a key value list that can store virtually any type of data.

AccountCalcDay.UserAdjustments, a decimal value that might be useful to store against each day and used in calculations or printed in audit summary pages.