Merge branch 'stable-2.7'

* stable-2.7:
  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-server/src/main/java/com/google/gerrit/server/patch/PatchScriptFactory.java

Change-Id: I26fd898a92577444a33b2cb7459487562d78a0b8