Merge branch 'stable-2.6' into stable-2.7

* stable-2.6:
  Use user's full name even when email is not configured
  Only handle last value change event for attached change screens
  Update the 2.6 release notes
  Fixed: Draft patch sets are visible in diff screens

Conflicts:
	gerrit-gwtui/src/main/java/com/google/gerrit/client/changes/ChangeScreen.java

Change-Id: I81caac73d26869f7be875118cc1e312a54e43a07