Business Layer; several Methods changed from a Sub to a Function

A number of methods in the Business Layer have been changed from a Sub to a Function.

These functions now return a Boolean True/ False indicating success/ failure, and if a failure set the error message.

The Methods include:

finAccountCalc
+ InterestTypeUpdate
+ OpeningDateUpdate
+ PaymentCycleUpdate
+ StartupInterestTypeUpdate

finAccountClient
+ AccountRoleIdSet

finAccountInterestRateChange
+ DateEffectiveSet

finBatchTransaction
+ElementIdSet

finClient
+ ClientGroupIdSet
+ ClientTypeIdSet

finClientContactAddress
+ ContactMethodIdSet

finClientContactMethod
+ ContactMethodIdSet

finClientGroupStatistic
+ StatisticTypeIdSet

finClientStatistic
+ StatisticTypeIdSet

finSecurityStmtItemAircraft, finSecurityStmtItemBoat etc
+ SecurityTypeIdSet

finAccountLog, finClientLog, finSecurityStatementLog, finUserLog
+ SourceSet