New module to manage authentication methods

[laurentj]

A page should list authentication methods that are available (authentication methods are supposed to be provided by a dedicated module, like the loginpass module).

On this page, an administrator should be able to

• activate/deactivate the authentication methods, by modifying the idp configuration parameter from authentication section.
• modify the order of authentication methods : on the login page, this order should be respected.
• configure each authentication method. links to forms could be displays as tabs ?

A new configuration flag should indicate if all parameters of authentication method can be viewed/edited, or if some critical parameters should be hidden (this parameters must be edited only by system administrators, by hand, directly into configuration files).

An event could be sent in order to retrieve available authentication methods and their informations (name, description, link to their configuration pages...).

A link to this page could be added to the sidebar menu of the application.