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/enig_error.js

@@ -46,4 +46,8 @@ exports.ErrorReasons = {
     NoConditionMatch    : 'NOCONDMATCH',
     NotEnabled          : 'NOTENABLED',
     AlreadyLoggedIn     : 'ALREADYLOGGEDIN',
-};
+    TooMany             : 'TOOMANY',
+    Disabled            : 'DISABLED',
+    Inactive            : 'INACTIVE',
+    Locked              : 'LOCKED',
+};