remove getAccuracy

assignedTripDict is not a cumulative list of assigned trips, so is not
a good data structure for measuring trip assignment accuracy. This
problem requires one to know what the actual trip_id is and compare it
to the assigned value, for each location/event/sequence of the
former. assignedTripDict calls its pop method in several places where
bad trips get dropped from the dict, and Null trips aren't assigned to
the dict.
replace getAccuracy with counters in predictor main

Get true trip IDs when grabbing df from database and compare against
trip assignments after each raw location is read in the for loop. This
makes for a comparable statistic to what is recorded in
BusTripper.classify where each raw location contributes.

Also remove runtime constraint and just print out accuracy after each
1000 locations.