[auth] Use a second authtkt policy for 'rememberme'
The former solution was buggy because the expire time of the auth cookie, if
set through 'remember', was lost on the first cookie reissuing.
The new approach, make possible thanks to multiauth, use two different cookies.
One for session bounded authentication (no 'rememberme'), and one for long
lasting authentication (w 'rememberme').
The choice between the two of them is done by adding a 'persistent' argument
to the top-level 'security.remember' call. Passing this argument will inhibate
a policy or the other.
The two policies are (a little) configurable through the
'cubicweb.auth.authtkt.[session|persistent].*' variables.
Related to #4985962
[pyramid\_cubicweb][] is one specific way of integrating [CubicWeb][] with a
[Pyramid][] web application.
### Features
* provides a default route that let a cubicweb instance handle the request.
### Usage
To use, install pyramid\_cubicweb in your python environment,
and then [include][] the package:
config.include('pyramid_cubicweb')
### Configuration
Requires the following [INI setting / environment variable][]:
* `cubicweb.instance` / `CUBICWEB_INSTANCE`
[pyramid\_cubicweb]: https://www.cubicweb.org/project/pyramid-cubicweb
[CubicWeb]: http://www.cubicweb.com/
[Pyramid]: http://pypi.python.org/pypi/pyramid
[include]: http://docs.pylonsproject.org/projects/pyramid/en/latest/api/config.html#pyramid.config.Configurator.include
[INI setting / environment variable]: http://docs.pylonsproject.org/projects/pyramid/en/latest/narr/environment.html#adding-a-custom-setting