Account Statements; optimised loading of Account Schedule

Previously, when creating an Account Statement during Account Processes, the Account was loaded, a full calculation run and then a second calculation to the Statement end date was run.

This means the calculation is undertaken twice, and the first calculation is a more expensive full calculation; whereas all that is necessary is the second calculation to the Statement end date.

This means the Account Processes Statement phase should run faster - our testing shows this part of Account Processes may be 10 to 15% faster.