Resolving ddr and aoi dependencies

[c71n93]

At the moment ddr and aoi uses decoration graph, but don't depend on this repository. Instead, ddr has its own graph implementation and aoi depends on ddr. Now dependencies looks like this:

I think we need to fix dependencies and make them look like this:

[0pdd]

@c71n93 3 puzzles #34, #35, #36 are still not solved.

[0pdd]

@c71n93 5 puzzles #35, #36, #39, #40, #41 are still not solved; solved: #34.

[0pdd]

@c71n93 4 puzzles #35, #36, #39, #40 are still not solved; solved: #34, #41.