* CLDC-3110: Update hard max income for ecstat 8 to 2000
* CLDC-3110: Update hard max income for ecstat 10 to match new highest max
* CLDC-3110: Base income validations on all tenants for lettings logs
* CLDC-3110: Tweak validation messages
* CLDC-3110: Use prefer not to say values when tenant ecstat is not specified