Package "lambda"

Must have, could be moved to "standard" Swi-Prolog library in my opinion.

Although a very nice library this is (I use it all the time), the meta-predicate declarations appear scattered throughout the file. However, SWI-Prolog expects them to occur at the top of the file, before the first clause.

Brilliantly useful. My one request is to support destructuring in the argument list -- though I guess this would not conform to lambda calculus syntax.

library(lambda) makes it more palatable to work with maplist, foldl, etc. I no longer have to create and name auxiliary predicates that are used in only one place.