Sort Tenant by 'Balance Due'

In the 'Contacts>Tenants' page add a column showing the tenants balance.(There is already a a column showing the account balance in suppliers but not in tenants which seems odd)

We can than sort the tenants by who has a debit balance as opposed to the dashboard that just shows invoices due without taking into account any payments on account that have been made by the tenant.

Also when selecting a tenant from this list add a 'shortcut/button' which runs a statement on account report for that tenant without having to go to the reports section to re-key this information. 

This 'report shortcut' could also be added to the 'Contacts>Tenants' page so we can run a statement of account for any supplier and see their expenses and payments