Re-implement experimentSummary

[shippy]

Will be very easy after implementing #29.

[shippy]

• Map the combination of probability and ambiguity onto a bag number.
• Map .colors onto which color wins.
• Map .choice / .choseLottery to text
• Do all this in a blockNum-by-blockLen struct array and save it into Data.Summary

[shippy]

Edit: bag number maps onto a combination of probability, ambiguity and winning color? Still a job for a lookup table.

[shippy]

Realization: there's no need to save all this in a struct. We can look it up perfectly well by getting blockId, trialId -- in fact, this does one better than the old version, since there's no need to convert drawn blockId to within-block-kind blockId.

[shippy]

experimentSummary might not be a good name for this function - trialSummary? - but fixing that can wait until #39.