Add deepsearch (Tiefensuche) implementation

[cbl]

[jonasclauss]

I don't know if this issue is still to do but as far as i can see, we've already implemented the deepsearch succesfully.

[jonasclauss]

The output exists of just 4 nodes even if you have 5 or more nodes.

[cbl]

Turns out, the problem could be solved by increasing the size.