SECURITY UPDATE

* Handle failed login attempts via Telnet
* New lockout features for >= N failed attempts
* New auto-unlock over email feature
* New auto-unlock after N minutes feature
* Code cleanup in users
* Add user_property.js - start using consts for user properties. Clean up over time.
* Update email docs

core/oputil/oputil_config.js

@@ -38,7 +38,7 @@ function getAnswers(questions, cb) {
 const ConfigIncludeKeys = [
     'theme',
     'users.preAuthIdleLogoutSeconds', 'users.idleLogoutSeconds',
-    'users.newUserNames',
+    'users.newUserNames', 'users.failedLogin', 'users.unlockAtEmailPwReset',
     'paths.logs',
     'loginServers',
     'contentServers',