Translate key presses into choseLottery right away

[shippy]

This is really simple to do at the time of choice, and relatively harder later.

(Doing this at the time of choice also allows flagging stochastic dominance issues for the experimenter's attention, but there are sufficient reasons to do this for its own sake.)

[shippy]

Moving into "Make equivalent" milestone, as almost the entirety of the code in experimentSummary is just post-hoc translation of choice * refSide into choice of reference or lottery.

[shippy]

Data.choice is currently set in both SODM choice phase scripts, as well as in handleResponse.m. This requires a DRY violation. Sad!