Patrik Dufresne authored Mar 01, 2017 and Patrik Dufresne committed Jan 20, 2018

Replace the /ajax endpoint by /api.

We had put in place a hack to properly handle the broken encoding with
cherrypy >= 5.5.0. This comparison was not working properly for cherrypy
v10.0.0. We had to change the comparison to use `distutils.version`.

To allow more flexibility when raising exception, add an error handler
in rdw_app to convert any known exception into the proper HTTP error
code (default to 500).

To workaround a new behaviour in CherryPy>=5.5.0 (#1485), force usage of
ISO-8859-1 to avoid conversion of the URL into UTF-8.

To simplify the login/logout, assemble all the handling of form
authentication into a single cherry tool. 
This new tools support the following feature:
- handle the session
- validate credential
- show login form when not login
- redirect to original page
- setup the `cherrypy.serving.request.login` with user object

Make use of UserObject everywhere.

To simplify the code use a page handler to serve favicon.

Provide a nice default error page that fit with our template.

Use native_str() to define configuration.

Make testcases run in py2 and py3

Ran `futurize --write --nobackups --stage1 --unicode-literals`

Split database and password validation.
Allow support for multiple password backend.

Refactor the preferences page to use plugins architecture.