Verify and test stacking code

[maray]

Verify and test stacking code

[cvalenzu]

The algorithm is currently running (doesn't show any exception or error) but still waiting for validation.

[maray]

@autopawn, you will still reimplement the algorithm?

[autopawn]

It doesn't seem necessary as the version that I saw that had problems (the one in the stacking repo) was not the right one, the right one (the one in acalib) could use some more tests but seems to be working.

[maray]

Thanks for the info, closing on behalf of #58