cleaner fact freshening, which also works in corner cases, e.g. if two backquoted facts have the same name (but have different variable indices)
#contributed components
contrib/cvc3-2.2
contrib/e-1.2
contrib/kodkodi-1.2.16
contrib/spass-3.7
contrib/scala-2.8.1.final
contrib/vampire-1.0
contrib/yices-1.0.28
contrib/z3-2.19