X-Real-IP support and Varnish PURGE config options

X-Real-IP for core functionality

Global config define REVERSE_PROXY_X_HEADERS

Config host and port for varnish PURGE

config option to specify PURGE protocol

exception in curl purge now shows error code

ipv6 x-real-ip addresses are now validated properly

X-Forwarded-Proto enabled by define

ext/pm_triggers/main.php

@@ -18,7 +18,7 @@ class PMTrigger extends Extension
         global $user;
         send_event(new SendPMEvent(new PM(
             $user->id,
-            $_SERVER["REMOTE_ADDR"],
+            get_real_ip(),
             $to_id,
             $subject,
             $body