[Caml-list] [ANN] Batteries 2.1

[Edgar Friendly <thelema314@gmail.com>]

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It's been a while since 2.0, and batteries has had a bunch of improvements
that should be shared with a wider audience.

More features, more bugfixes, more batteries.

Thanks to the *many* contributors in this release; batteries exists because
of you.

E.

Changelog:

Added:
Array.{avg,favg,singleton},
Bigarray.of_enum,
Hashtbl.{modify,modify_def,modify_opt,map_inplace,filter_inplace,filter_opt_inplace},
IMap.{modify,modify_def,modify_opt}, LazyList.lazy_fold_right,
List.{singleton,unfold,min_max,modify,modify_dep,modify_opt, span, nsplit,
group_consecutive},
Map.modify_opt (*3),
MultiMap.modify_opt (*3),
MultiPMap.modify_opt (*3),
Option.{default_delayed , map_default_delayed},
Set.find, Set.Incubator.op_map,
String.rev,
Substring.{equal,contains,iteri,enum}
Fixed:
Compilation with Ocaml 4.01
Speedup in LazyList.append
More organized magic for fast list snoc
Speedup in String.{replace,nreplace}
Cleanup int32.[un]pack exceptions
Fix last bit access in BatBitSet
Float.round corner case on predecessor of 0.5 fixed
Fix Enum.concat's clone implementation
Fix List.n_cartesian_product to allow empty input
Fix BatText.rfind's index calculation
Improve Pervasives.undefined to be curry-able
Array.backwards doesn't clone array anymore
Remove useless allocation in Splay.cfind
More unit tests, benchmarks

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