Identification module

[cthoyt]

This issue is more of an epic:

Acyclic directed mixed graphs

• OneLine ID (Implement One-line ID Algorithm #3)
• ID on a joint distribution (Implement identify algorithm #4; Implement the ID and IDC algorithms #46)
• IDC on a conditional distribution (Implement the ID and IDC algorithms #46)
• ID* on a joint counterfactual distribution (Implement the ID* Algorithm #69)
• IDC* on a conditional counterfactual distribution (Implement the IDC* Algorithm #70)
• gID on both observational and interventional probabilistic expressions as input (Implement the gID algorithm #72)
• gIDC (does this exist?)
• data ID (Implement the data identification algorithm #73)

Input/output directed mixed graphs

These algorithms are slightly relaxed and can handle graphs containing cycles. They are obviously useful for biological networks, where the previous sets of algorithms aren't applicable.

• ioID (Implement the cyclic ID (ioID) algorithm #71)