Fixed a bug about enabling trace with profiling.

framework/yii/log/Logger.php

@@ -161,7 +161,7 @@ class Logger extends Component
 	public function log($message, $level, $category = 'application')
 	{
 		$time = microtime(true);
-		if (YII_DEBUG && YII_TRACE_LEVEL > 0) {
+		if (YII_DEBUG && YII_TRACE_LEVEL > 0 && !($level & self::LEVEL_PROFILE)) {
 			$traces = debug_backtrace();
 			$count = 0;
 			foreach ($traces as $trace) {

framework/yii/log/Target.php

@@ -184,7 +184,7 @@ abstract class Target extends Component
 	 * @param array $except the message categories to exclude. If empty, it means all categories are allowed.
 	 * @return array the filtered messages.
 	 */
-	public function filterMessages($messages, $levels = 0, $categories = array(), $except = array())
+	public static function filterMessages($messages, $levels = 0, $categories = array(), $except = array())
 	{
 		foreach ($messages as $i => $message) {
 			if ($levels && !($levels & $message[1])) {