Change graph matching

[ojongerius]

I've used the title as identified during the initial POC.

TODO:

• [ ] Use the hash of a graphs properties to identify graphs.

[ojongerius]

My original idea did not make sense -there is no external ID, so we need to piggyback it on something.

I made it better by adding the ID to the title, but I wish there was a better solution, open to suggestions.