Merge Connected and Candidate

These two notions are very correlated. Since connected has the most
generality, it makes sense to generalize it to encompass what is
covered by candidate.

    STC:
    LLR: 4.03 (-2.94,2.94) [-3.00,1.00]
    Total: 11970 W: 2577 L: 2379 D: 7014

    LTC:
    LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
    Total: 13194 W: 2389 L: 2255 D: 8550

bench 7328585