refs #73 change in heading and labels
refs #73 disable Payment Clearing, Cheque Clearing for Export BL
refs #74 added rate agreed and weight field for new order-> import
refs #72 added equipment type on import->history
refs #75 added migration to add column invoice_number to import_expenses
refs #75 added invoice number on import_expense edit screen
refs #75 added migration to add invoice fields to movement
refs #75 added invoice fields to export->history
refs #75 invoice fields made editable: export->history
refs #77 customer_name made non-editable import->port
refs #73 change in BL payment screen heading