Interoperability with other OpenHAB instance

I quickly reviewed the PR and added some comments. I would like to take a deeper look to JSONDB files and perform a diff with my current setup (for example, I am using Javascript transformations for integrating an open thermometer that would be lost).

I find instructions pretty clear. I would try it as soon as I get some time. I am eager to try them! I will learn a lot BTW. Thank you for your work!