vTiger PDF invoice and quote layout fix

Our PDF is pretty much standard. Just to adjust the billing address location and size, shipping address is removed. 1. Change product code to service code 2. Product name to service name. 3. Remove nettotal, shipping and handling charges & tax. 4. expand the content layout. 5. Insert sign to accept quotation line and text in Quotation last page. 6. We have created transaction details in invoice custom field. Make it appear in invoice when we print out.