3.12

• add containers.pp sublibrary, with Wadler-style pretty printing combinators

• add CCArray.{max,argmax,min,argmin} and their _exn counterparts

• add CCParse.take_until_success

• add Option.flat_map_l

• add CCSet.{find_first_map,find_last_map}

• CCHash: native FNV hash for int64/int32

• fix bugs in CCParse related to recurse and Slice

• fix: fix Set.find_last_map on OCaml 4.03

• fix: make sure Vector.to_{seq,gen} captures the length initially