Add 2 simple functions to invoice script (Logic Invoice)

I use Logic Invoice for my invoicing. You can see a demo of [login to view URL] and the code you can see it here [login to view URL] I need to add 2 functions on this script 1) Add “Payment Method” to the search filters on the invoice list 2) Possibility to change the invoice statuses in bulk in the invoice list PLEASE SEE THE ATTACHED PDF FOR MORE DETAILS This is an easy job if you know what you are doing, so the cheapest the best, I will use this small project as a test for bigger projects, if you do it well I will select you for bigger projects