Updated rathaxes graph tests to a functionnal graph
Fix previous commit: forgotten files.
Bit of refactor to prepare for multiple separated algorithm tests
Fix the graph building algorithm

 - Simplify the graph building code
 - Update the structuration of the data for the graph builder
 - Fix a bit the identity_match request through the addition of a new
 set of constraints
Fix and activate the identity match test

The test now works after a bit of fixing.