reason:
 - Expires header is widely supported than max-age. e.g.: HTTP/1.0 clients.
 - max-age directive always overrides Expires setting under HTTP/1.1,
   so there is no need to remove Expires here.

so that varnish recipe can be used without webchecker.

(cherry picked from commit c060818b385d8af429725fb9c53fdb8068ad21d5)

(cherry picked from commit 7d8d21d815e6a99ba5959d28b7d59c69d034e8c3)

6.7.6-7 fixes issue of darkening some images.
(cherry picked from commit 62885346a1b66d7d7d94b682c37316ad0b622a6a)

(cherry picked from commit 22b4543965c38a5b6c78730240c3dbfdd8079781)

The librsvg contains rsvg-convert, the command used by imagemagic
to convert svg to png.

This is a cosmetic modification. Functionally, there is no change.

"Introduce the best practices from erp5 public web sites experience."
1ed2b682

This commit only includes functional modification.

This reverts commit 1ed2b682.

add a workaround for https://bugs.launchpad.net/maria/+bug/985828 that causes wrong result in Resource_zGetInventoryList etc.
(cherry picked from commit f22f2c9d5718ecf0229eb947cbac7ed335427310)

commit d42a85e53c313984de1dbeb7ca8eb432a5286c3a
Author: Kazuhiko Shiozaki <kazuhiko@nexedi.com>
Date:   Wed Apr 18 14:12:11 2012 +0200

    version up : Apache httpd 2.4.2.

commit bbbd38c26ba87cf2b0fd2c17414c99fa84d36dbc
Author: Kazuhiko Shiozaki <kazuhiko@nexedi.com>
Date:   Fri Apr 13 12:41:47 2012 +0200

    version up : Python 2.7.3.

commit 09de24474197a0650f8b67003007d295efe532d9
Author: Kazuhiko Shiozaki <kazuhiko@nexedi.com>
Date:   Wed Apr 11 18:09:08 2012 +0200

    follow the change of mariadb header location.

commit ba53784a3d34f75a2f49c63b6f78f15c2758e48b
Author: Kazuhiko Shiozaki <kazuhiko@nexedi.com>
Date:   Wed Apr 11 18:06:10 2012 +0200

    add mroonga-2.01-mariadb-5.5.23.patch.

commit 165486e2ce57e7a13b92b8d407b3e019b6e8b4fb
Merge: afc2f29 783ed21b
Author: Kazuhiko Shiozaki <kazuhiko@nexedi.com>
Date:   Wed Apr 11 17:24:16 2012 +0200

    Merge remote-tracking branch 'origin/erp5' into erp5-component

commit afc2f2905faf0af1b938c664fa75a45cfb7ae7d5
Author: Kazuhiko Shiozaki <kazuhiko@nexedi.com>
Date:   Wed Apr 11 17:24:13 2012 +0200

    version up : MariaDB 5.5.23.

commit b49ffa1de1ee7c1833358a1c9b069eb82b50f5b0
Author: Kazuhiko Shiozaki <kazuhiko@nexedi.com>
Date:   Wed Apr 11 17:20:27 2012 +0200

    version up : Python 2.6.8.

commit 3e36266d47faff6b6700f41fbd76caa0cf021bbe
Author: Kazuhiko Shiozaki <kazuhiko@nexedi.com>
Date:   Thu Apr 5 22:02:58 2012 +0200

    clear pre-defined system glib header path, because it has higher priority than our own specified one.

commit 2b9d6b0036adf4564379ff74558fc00c4a475a75
Author: Kazuhiko Shiozaki <kazuhiko@nexedi.com>
Date:   Thu Apr 5 14:44:56 2012 +0200

    sphinx_snippets function seems not exist in sphinx storage engine included in mariadb 5.5.

commit c83854cf65be83297287353ac5e5df4240460108
Author: Kazuhiko Shiozaki <kazuhiko@nexedi.com>
Date:   Thu Apr 5 14:11:12 2012 +0200

    version up : LibreOffice 3.5.2.

commit 6d6becd3697a5905db36b4786909aa19fd370f44
Author: Kazuhiko Shiozaki <kazuhiko@nexedi.com>
Date:   Wed Apr 4 13:33:17 2012 +0200

    build sphinx storage engine as a dynamic plugin instead of statically embed in mysqld.

Make varnish recipe use 3.0.x version varnish.

More details can be found on:
https://mail.zope.org/pipermail/zodb-dev/2010-April/013287.html

Kudos to Łukasz for noticing.

Especially, explain what is meant by "last call".