Account Applications; enhanced logic behind Client Statistic Sets

Client Statistic Sets for Account App Applicants has been enhanced.

A new function has been added to finClientStatisticsSets, AddForAccountAppApplicant. This would generally be accessed via the Client object, e.g.Client.StatisticsSets.AddForAccountAppApplicant().

This function returns a new Statistics Set for the Client and would be used in the UpdateClientFromApplicant method of the Account Application script. It flags any "Open" Statistics Sets for the Client as "Rejected" with a note "Rejected when updating Account Application.". A new "Open" Statistics Set is added for the Client and it's source is set to "Account Application".

In addition Client Statistic Sets now include a "Source" property. This will normally be "Default", but if created via the above code will be set to "Account Application". It may also be set directly on the Client Statistic Set object.