Extended witness complex calculation
Extended witness complex calculation

* Suporting different values of `nu` parameter
* Fixed incorrect element access

The algorithm is not yet very *smart* and performs many calculations in
a cumbersome manner. Moreover, there is no control over the weights; at
present, the standard maximum assignment of weights will be used, which
follows the original paper.

Submanifold/Aleph,Submanifold/Aleph,Submanifold/Aleph