[REM] Remove LoginForm javascript
[IMP] database selector, do not display Continue button for javascript
[IMP] Move footer to login_layout
[MERGE] upstream
[FIX] pass request.context in /web/login
[FIX] /web/login: Set request.uid on auth=none so it's correct if overloaded with auth="public"
[MERGE] upstream
[IMP] Improve login for auth_signup/oauth seperation
[FIX] Database selector issue

ensure_db() If the request.session.db is different than
the computed db abort and redirect in order to properly
dispatch on computed db