Merge "Add UserMailerTransformX and UserMailerSplitTo hooks"

diff --combined RELEASE-NOTES-1.27
index 65e0799,e3af802..d9d8359
--- 1/RELEASE-NOTES-1.27
--- 2/RELEASE-NOTES-1.27
+++ b/RELEASE-NOTES-1.27
@@@ -14,13 -14,19 +14,21 @@@ production
    $wgResourceLoaderMinifierMaxLineLength, because there was little value in
    making the behavior configurable. The default values (`false` for the former,
    1000 for the latter) are now hard-coded.
 +* $wgDebugDumpSqlLength was removed (deprecated in 1.24).
 +* $wgDebugDBTransactions was removed (deprecated in 1.20).
  
  === New features in 1.27 ===
  * $wgDataCenterId and $wgDataCenterRoles where added, which will serve as
    basic configuration settings needed for multi-datacenter setups.
    $wgDataCenterUpdateStickTTL was also added.
+ * Added a new hook, 'UserMailerTransformContent', to transform the contents
+   of an email. This is similar to the EmailUser hook but applies to all mail
+   sent via UserMailer.
+ * Added a new hook, 'UserMailerTransformMessage', to transform the contents
+   of an emai after MIME encoding.
+ * Added a new hook, 'UserMailerSplitTo', to control which users have to be
+   emailed separately (ie. there is a single address in the To: field) so
+   user-specific changes to the email can be applied safely.
  
  ==== External libraries ====