Include libsass instead of node-less

Thank you to @d-fence for testing this.

On Ubuntu Xenian, the Odoo package was difficult to install because
three Debian packages were required but could not be found in Ubuntu
repositories. As those packages are not really crucial, they are
now only suggegsted by the Debian package which is therefore
installable on Ubuntu Xenial. One can manually install them as
explained in the documentation.

Closes #20000

Purpose: openid is not used anymore in Odoo, therefore it can be
safely removed.

* Add a minimum systemd service file

Complements 021de21e and #16918

Before this patch, the debian package depends on `python-pybabel`.
According to the documentation, this is a dummy package for transition
from `python-pybabel` to `python-babel`[1].

This dummy package has thus been removed in debian stretch in favor of
`python-babel`, and the odoo package is thus not installable in debian
stretch.

To fix this, we depend directly on `python-babel`, which is available in
all debian releases[2].

Closes #13905

[1] https://packages.debian.org/jessie/python-pybabel
[2] https://packages.debian.org/jessie/python-babel

They were there since long time but to allow some obscure test
to run. As they don't bring anything let's just drop them.

* Remove dependency on less-plugin-clean-css which distribution
  packages are broken on debian stretch and derivated.
* Updated documentation.
* Lessc provides a `--compress` argument that could solve this issue.
  According to the documentation at http://lesscss.org/usage/: "[...]
  Compress using less built-in compression. This does an okay job but
  does not utilise all the tricks of dedicated css compression[...]"
  However, using this argument works on lessc 2.5.3 but not on 1.4.2
  (`--compress` arg is present but seems to be break some rules
  i haven't been able to put my finger on).
* Finally, use the minification of the StylesheetAsset that takes care
  of removing the spaces, the comments and the sourcemap with regexes.

fixes issue #9113

introduced by rev c1ff5d89

because it's available in debian stable but not in ubuntu 14.04 (lts)

The stdlib version of the json library is more recent than the 3.5.3
version we are pinning in `requirements.txt`

There is no reason to use it.

Closes #6940

The `unittest2` package is simply a backport of `unittest` from the
Standard Library of Python 2.7 to previous versions.

There is no reason to use it any longer.

Closes #6941

99% of the contributors have signed the CLA
The rest of them have been contacted by email
and are free to either sign the CLA or ask
for their contributions to be removed from
Odoo Community Edition.

See also:
- https://www.odoo.com/cla
- https://www.odoo.com/blog/odoo-news-5/post/adapting-our-open-source-license-245

This library is a SOAP client. It will be used to integrate Odoo with
external web services that use SOAP based protocols.

- control:
	- duplicated Section entry removed
	- X-Python-Version added
	- Uploaders added
- init:
	- set odoo.py as deamon instead of openerp-server
	- source /lib/lsb/init-functions to fix Debian lintian warning
	  init.d-script-does-not-source-init-functions
- copyright: machine-readable (dep5) copyright

Mainly renaming of OpenERP into Odoo

[REF] Packaging: backport of a7ab5a41
[REF] Packaging: backport of a700a113
[REF] Packaging: backport of 9d0bd280
[REF] Packaging: backport of b0722d3e
[REF] Packaging: backport of 24b2c938
[REF] Packaging: backport of e874cdaf
[REF] Packaging: backport of 56b61da1
[REF] Packaging: backport of be96dd85
[REF] Packaging: backport of 50a4da99
[REF] Packaging: backport of 1c41f369
[REF] Packaging: backport of cc113317
[FIX] Packaging: backport of 13471630
[REF] Package: backport of 93845d68
[REF] Package: backport of 012bc01c
[FIX] Package: partial apply of d9e72a37
[REF] Package: backport of 67036fef
[REF] Package: backport of 73de0138
[REF] Package: backport of 30d987ed
[REF] Package: backport of 29132669
[REF] Package: backport of 7db12dc4
[REF] Package: backport of f668f9c6
[REF] Package: backport of 2cf4051a
[REF] Packaging: backport of 73592487
[REF] Packaging: backport of f2598ecd
[REF] Package: backport of fd21912c
[REF] Package: backport of 9a8cdf49
[REF] Package: backport of 2f4984b8
[REF] Package: backport of 6e9edeeb
[REF] Package: partial backport of d4624fa8
[REF] Package: backport of 9f13722f

[FIX] Debian: updated informations and dependencies, refactored debhelpers scripts to allow easy name change, simplified debhelper rules

It's needed because fc8592ad is now loading the `pyPdf` package.

- move packaging stuff to setup
- remove historical stuff
- remove oe, odoo-cmd-fme will be merged with the convered commands
- add an odoo.py script to run odo and boostrap it
- simplify README
- prepare to move documentation to the github wiki

bzr revid: fme@openerp.com-20140327125714-gu682vzggb7rva80

bzr revid: al@openerp.com-20140214111454-oatpkjqrbclypzi7

bzr revid: al@openerp.com-20131015015800-68pcdv8fg573gi44

bzr revid: vmt@openerp.com-20130221121825-dvpacxajwztslukj

bzr revid: al@openerp.com-20130214104833-pu2ebksafhml1fr0

bzr revid: al@openerp.com-20121217112252-c1kt0j0bmzu31bzo

bzr revid: al@openerp.com-20121210010213-v32y3cn5tgwknlj6

bzr revid: al@openerp.com-20121209024618-cae0ux1vmo38ccwr

bzr revid: al@openerp.com-20120922111033-jzxjr8fpm15a3510

Was added to setup.py but not in deb packaging.

bzr revid: odo@openerp.com-20120907160725-gb4to44oc0wzccwq

bzr revid: al@openerp.com-20120112140234-fzkosusicvpw6pf5

bzr revid: al@openerp.com-20111006021841-blwc0r0uz3x07mxh

bzr revid: al@openerp.com-20111003013956-kekmedzn8qm3u3s7