Output of PyCupid algorithms

[mavillan]

The full output of CUPID algorithms are not just the Clump Assignment Array, but an NDF structure which also contains statistics about the clumps found.

We need to implement a full_output version of the PyCupid implementation, which returns this information in a ad-hoc structure (python dictionary). This can be done extracting this data from the NDF of CUPID, or computing these statistics over the CAA directly over Python.