[Log] Feature request

hi what do you think about giving a possibility to limit log messages to higher than some given level? having milions of [debug] messages can be a real problem in finished products. my proposition is to add a variable (for example $minLogLevel) and ignore all messages that are on lower priority than this value. you`ll need to set proper values to priorities in Log class (or is their order already proper?) and then add a line like this in Log_*::log method: if($priority < $this->$minLogLevel) return; setting $minLogLevel to lowest priority in constructor will keep compability with existing applications using Log_* rashid