thinkthen - The ThinkThen Verbs for R

The eight verbs (decide, choose, score, tag, filter, rank, find, annotate) plus recognize and relate, with a tt_ prefix, over the thinkthen Rust library. A column goes in and a column comes out. NA is "not sure". A bulk call crosses into the engine once and runs at the engine's throttle. Errors carry one of six kinds and a retry signal.