Merge pull request #20093 from larssandergreen/mailings-AB-test-improvements

dev/core#2100 Improve A/B test report page and API Mailing stats

diff --cc CRM/Mailing/Event/BAO/Bounce.php
Simple merge

diff --cc CRM/Mailing/Event/BAO/Delivered.php
Simple merge

diff --cc ang/crmMailing/services.js
Simple merge

diff --cc api/v3/Mailing.php
Simple merge

diff --cc tests/phpunit/api/v3/MailingTest.php
Simple merge