2.6.1 release notes

• User’s fullname is not showing up in /configuration/users. Issue: #2200
• Deleted documents cause sentinel log spam. Issue: #1999
• Disable nools for unrestricted users. Issue: medic-projects#149
• Update libphonenumber and use strict validation. Issue: #2159 #2196
• Contacts export response garbled. Issue: #2187