Please backport lwt 2.1.1-1 (universe) from natty

Please backport lwt 2.1.1-1 (universe) from natty to lucid.

Reason for the backport:
========================
Needed for ocsigen which is needed for ben.

Testing:
========
Mark off items in the checklist [X] as you test them, but please leave the checklist so that backporters can quickly evaluate the state of testing.

You can test-build the backport in your PPA with backportpackage:
$ backportpackage -u ppa:<lp username>/<ppa name> -s natty -d lucid lwt

* lucid:
[x] Package builds without modification
[x] liblwt-glib-ocaml installs cleanly and runs
[x] liblwt-ocaml-doc installs cleanly and runs
[x] liblwt-glib-ocaml-dev installs cleanly and runs
[x] liblwt-ocaml-dev installs cleanly and runs
[x] liblwt-ocaml installs cleanly and runs
[x] liblwt-ssl-ocaml-dev installs cleanly and runs

Reverse dependencies:
=====================
The following reverse-dependencies need to be tested against the new version of lwt. For reverse-build-dependencies (-Indep), please test that the package still builds against the new lwt. For reverse-dependencies, please test that the version of the package currently in the release still works with the new lwt installed. Reverse- Recommends, Suggests, and Enhances don't need to be tested, and are listed for completeness-sake.

liblwt-glib-ocaml
-----------------

liblwt-ocaml-doc
----------------

liblwt-glib-ocaml-dev
---------------------

liblwt-ocaml-dev
----------------

liblwt-ocaml
------------

liblwt-ssl-ocaml-dev
--------------------
* ocsigen
  [x] lucid (Reverse-Build-Depends)