replace blog jar with one including debugging symbols
fix recursion that falls off the end and returns Model.NULL
fix row/column confusion
provide velocity & steering in every timestep

(Looking up old values from within BLOG doesn't work, because BLOG
forgets the past...)
work around https://github.com/BayesianLogic/blog/issues/330
update eval script
output query results to file
adjust tolerance; sensor times in new datasets are less accurate
use IsotropicMultivarGaussian instead of MultivarGaussian

(massive speedup)