[auth] Use pyramid_multiauth It makes it easier to finely tune what parts of the default authentication stack we want to use or not. It also makes it possible for any cube to add its own policy in addition to the others. Related to #4985962

[auth] remove dead code (closes #5230746)

[login] Test the login views

Fix project homepage url

Replace the '_' with '-' in the package name The change was made manually on pypi (see https://sourceforge.net/p/pypi/support-requests/459/)

On exceptions from CW, copy headers Closes #4939219

[doc] fix pyramid-auth-secret conf sample

[doc] Update change list

[core] Protect session data from unwanted loading. Use specialised Session and Connection types that forward their 'data' and 'session_data' attributes to the pyramid request.session attribute. This forwarding is done with properties, instead of copying a reference, which allow to access request.session (and the session factory) if and only if Session.data or Connection.session_data is accessed. In some cases, most notably the static resources requests, it can mean no access the session during the request handling, which saves a request to the session persistence layer. Closes #4891437

[core] Use tools.cached_user_build for better performances Closes #4870347