Client Auditing; updated information stored when Address or Contact details change on a Client

Client Auditing for Address and Contact details has changed as follows:

1. New records are now audited.
2. Additional information is now included, i.e. Pk, Sub-Type, Flags (Html, Phone, SMS etc), Date From/ To, Historic and Notes.
3. Audit information is now stored as a key value list rather than a simple text string.