fewer monomorphic instances are necessary, thanks to Sascha's new monomorphizer -- backed up by Judgment Day

compute the set of base facts only once (instead of three times in parallel) -- this saves about .5 s of CPU time, albeit much less clock wall time

use existing ghc on macbroy20;

local gensym based on Name.variant; do not export internals by default;

uniform use of flexflex_rule;

tuned name (cf. blast_stats);