Simple test for 1st and 2nd elements
Test for 3 level search
Test for 4 level search
Test with depth limit (inferior)
Test with depth limit (superior)
Improve test and name jocker
Refactor uniqueness (handle node and link uniqueness)
Refactor depth superior limit
full refactoring on my side
Merge branch 'executer' into develop
main constraints (depth, uniqueness, mode)