LP#1708487 Add Title and Barcode to Bill Print Templates

LP#1708487 Add Title and Barcode to Bill Print Templates

- Add additional documentation to Bills, Current; Bills, Payment; and Bills,
Historical print templates.
- Convert xacts to objects containing all required information for print
templates

Signed-off-by: Kyle Huckins <khuckins@catalyte.io>
 Changes to be committed:
	modified:   Open-ILS/src/templates/staff/share/print_templates/t_bill_payment.tt2
	modified:   Open-ILS/src/templates/staff/share/print_templates/t_bills_current.tt2
	modified:   Open-ILS/src/templates/staff/share/print_templates/t_bills_historical.tt2
	modified:   Open-ILS/web/js/ui/default/staff/circ/patron/bills.js