[Caml-list] ANN: batteries 2.2.0

[Gabriel Scherer <gabriel.scherer@gmail.com>]

Batteries (OCaml Batteries Included) is a community-developed overlay
over the "standard" library distributed with the compiler, that aims
to provide general-purpose data-structures and convenient functions.

The project follows a semantic versioning scheme; the new version is
backward-compatible with the previous releases 2.1.0 (July 2013) and
2.0.0 (January 2013). The lowest OCaml version certainly supported is
3.12.

The new release is available in OPAM, or as a tarball
  https://forge.ocamlcore.org/frs/download.php/1363/batteries-2.2.tar.gz
  https://github.com/ocaml-batteries-team/batteries-included/releases/tag/v2.2.0
or from the sources
  https://github.com/ocaml-batteries-team/batteries-included
The online API documentation is at:
  http://ocaml-batteries-team.github.io/batteries-included/hdoc2/

This new version saw increased commits from new contributors, which
did most of the work that is included in this release: François
Berenger (which also did a good share of work for the
previous release), Simon Cruanes, and Jacques-Pascal Deplaix. As you
can see, it is the right time for people with a name in the beginning
of the alphabet to contribute -- and others.

As always, the work in this release is split between some code
improvements and some new functions. Some highlights include:

- val split_opt: elt -> t -> t * elt option * t
  on sets, as a generalization of stdlib's
  split : elt -> t -> t * bool * t
  (François Berenger)

- various cartesian_product functions, including one for Enum
  accommodating infinite enumerations
  (Simon Cruanes)

- kahan_sum functions for slower but numerically-accurate summation of
  floats ( http://en.wikipedia.org/wiki/Kahan_summation_algorithm )
  (Gabriel Scherer)

- val filteri : (int -> 'a -> bool) -> 'a list -> 'a list
  val filteri_map : (int -> 'a -> 'b option) -> 'a list -> 'b list
  (Jacques-Pascal Deplaix)

- val bsearch :
    'a BatOrd.ord -> 'a array -> 'a ->
      [ `At of int | `Just_after of int
      | `All_lower | `All_bigger | `Empty ]
  (Simon Cruanes)

Remarkably, there was only one bug fixed (by its reporter
Jonas Jensen) during this release circle.

With many thanks to Francois Berenger, Cedric Cellier, Simon Cruanes,
Jacques-Pascal Deplaix, David Fourchaux, Rudi Grinberg, Jonas Jensen,
Kensuke Matsuzaki, and Eric Norige.