PURPOSE Make various changes to the website.visitor views to improve readability and ease marketing analysis. SPECS The changes include notably: - Add/rename/move fields/filters elements - Remove some unnecessary information or put it in optional="hide" in tree view - Add website_id information (with the multi-website group) - Slightly rework layouts (new widgets / spacing / images / buttons / ...) - Move some technical information into the "debug mode" LINKS Task 2092302 ENT PR odoo/enterprise#14611 UPG PR odoo/upgrade#1902 closes odoo/odoo#61417 Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>