List A/B tests

Every A/B test of the site with its widgets and their results, as on the admin's A/B tests page. For each widget: views (times shown), actions (forms sent and buttons used) and ctr = actions / views, counted from added_at; leader_id is the widget ahead. findings are facts about the test setup: tell the user each one with what to do. A site runs up to five tests, named 1 to 5; visitors are split evenly between the widgets of a test that are on, and each visitor keeps the same widget on every visit. A widget's statistics over any period are in Widget statistics. How to read and run a test: the guide widgets.activity.read, topic ab_tests.