[FIX] prevent an incorrect state in autocompletion

When going up and wrapping around, the focus was on a hidden separator,
so hitting enter = stacktrace.  Now, the focus goes on the last
selectable list item.-
[FIX] im_chat, im_livechat : style, js notification and bundle without achtung lib
Merge pull request #846 from odoo-dev/master-autocomplete-quick-fix-ged

[FIX] prevent an incorrect state in autocompletion
[IMP] [FIX] website_forum: cleaned and improved the management of available actions based on the user's karma. The karma levels are now stored on the forum itself, allowing customization. The various check of karma are done at model level and not at controller level anymore, leading to a more secure and easier to inherit behavior.
[FIX] tour.js: tour shop

wait that the snippets are loaded before clicking on the picture and open the media editor.
Merge pull request #771 from odoo-dev/master-forum-imp-tde

[IMP] forum: better management of karma-based actions, using calculated fields and view simplification
[IMP] website_blog: minor improvements in post form view (use group)