Commit cf853a78 removed all yml tests
and the yml import engine from Odoo forever, however PyYAML remains a
dependency even though it's not used anymore.

This commit removes any reference to this lib that could be found.

closes odoo/odoo#27563

Since 565277ac sassc is used as a
fallback when the python libsass is not available.

With this commit, the saasc package dependency is added to the rpm to
avoid installing libsass with pip.

Include libsass instead of node-less

Thank you to @d-fence for testing this.

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

python3-psycopg2 package was missing in the RPM.

Purpose:
    The psycogreen module is unmaintained. Last source update was in
    2015 and last pypi package was in 2012. Odoo only use a small
    part of the psycogreen module that could be written directly in
    the odoo code. This commit reproduce the small function from
    psycogreen used in ODoo and remove all depencies from it.
    Also the copyright and license are honored and the documentation
    is updated accordingly.

    pypi pckage: https://pypi.python.org/pypi/psycogreen
    bitbucket repos: https://bitbucket.org/dvarrazzo/psycogreen/

* 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

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

[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

PyChart is now in the EPEL repo so we now list it as required in
setup.cfg. The other mandatory lib not provided by EPEL are
pyPdf, vatnumber and pydot and are now installed by easy_install
during the post install.

By default, the package was installed in /usr/local/lib/python2.7 in CentOS7.
It is problematic because most of other python packages are installed in /usr/lib
and also because /usr/local/lib is not in the default PYTHONPATH. It's fixed by
overriding the install script and forcing prefix to be /usr.

Added a minimal systemd unitfile.
Adapted tests accordingly.

[ADD] RedHat: defined the dependencies and added a post-install script to create the odoo user, the odoo configuration file, ...

- 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: al@openerp.com-20111006031426-6vkjnku1tygyhptb

bzr revid: al@openerp.com-20110926005444-a7vqjb05vep7xbvj

bzr revid: stephane@openerp.com-20101018220003-c1mjlq507djn4lxi

bzr revid: jvo@tinyerp.com-20100511143954-exhrzxidou2r3j2a

bzr revid: stephane@tinyerp.com-20090212234009-laxvd7ezteq256k8

bzr revid: stephane@tinyerp.com-20090208233812-5qa8ik7j7mmcz0xf

bzr revid: stephane@tinyerp.com-20090208232536-3149vmfra424p661

lp bug: https://launchpad.net/bugs/311981 fixed
lp bug: https://launchpad.net/bugs/314575 fixed

bzr revid: stephane@tinyerp.com-20090123121404-345vxufyn1beqjt4

lp bug: https://launchpad.net/bugs/311981 fixed

bzr revid: stephane@tinyerp.com-20081229102859-bgxe0btq1d315a6m