Add warnings pointing to latest manual version on all old manual pages

lib/Manual.php

@@ -0,0 +1,23 @@
+<?
+
+class Manual{
+	public static function GetLatestVersion(){
+		$dirs = glob(MANUAL_PATH . '/*', GLOB_ONLYDIR);
+		sort($dirs);
+		return str_replace(MANUAL_PATH . '/', '', $dirs[sizeof($dirs) - 1]);
+	}
+
+	public static function GetRequestedVersion(){
+		try{
+			if(preg_match_all('|/manual/([0-9]+\.[0-9]+\.[0-9]+)|ius', $_SERVER['REQUEST_URI'], $matches)){
+				return($matches[1][0]);
+			}
+			else{
+				return null;
+			}
+		}
+		catch(\Exception $ex){
+			return null;
+		}
+	}
+}