Openbravo Changes

Need a few changes on Openbravo. All of these changes are in Restaurant mode. Also need source code at the end of project. 1) Ability to add a "Tip" & Signature on the receipt. Once they pay, they can leave additional amount for the server. Then you can go back in and change the total amount charged. 2) Ability to combine tables in Restaurant Mode (Combine Table 1 with Table 2 into one receipt) 3) Add a button to Split in Amount (Charge credit card #1 11.00 dollars and charge credit card #2 9 dollars) 4) Add Discounts under "Free" Tab. Preset amounts, modifiable by a resource, and an input box where you can specify how much to deduct from the check. 5) Add a button that duplicates the highlighted product (+1 more of that item) Some of these are minor, and some of these require a little more time.