Nomenclature1

[ethanplunkett]

First round of nomenclature cleanup.
collapse_distr(x, bf) -> flatten_raster(raster, bf)
expand_distr(x, bf) -> expand_distr(distr, bf)
get_transition(x, bf) -> get_transition(x, transition) (switch and rename arguments)
get_distr(which, bf, from_marginals) -> get_distr(x, which, from_marginals) (switch and rename arguments)
lookup_transitions(start, end, bf, direction) -> lookup_transition(x, start, end, direction) and don't export
evaluate_perfomance(bf) -> evaluate_performance(x) (spelling and argument)
find_dead_ends() -- don't export
find_threshold() -- don't export
fix_dead_ends() -- don't export
import_prototype() -- don't export
sample_distr(x, n = 1) -> sample_distr(distr, n= 1)