added a "gui" field to the barterDEX startup json so we can track which GUI is most used.

For those that missed it, we are offering multiple 10,000 KMD bounties for barterDEX GUI. At a minimum it needs to support KMD, BTC and the assetchains and be an original implementation. Preferably from a slightly different point of view than the other GUI.

This is about $20,000 per GUI at today's prices and of course once we get one or more GUI for barterDEX that people are happy with, the price is expected to reflect that.

Just contact me if you feel you are able to make such a GUI with some rough ideas (screenshots) and I will reserve the 10,000 KMD for your GUI completion. By complete, that means real users actually using it as evidenced by the "gui" field set to your GUI for completed transactions in the stats records of the atomic swaps.