private static void logToFile(final String level, final String message, final Throwable t) {
        if (logFileWriter != null) {

            logFileWriter.write(LOGFILE_ENTRY_FORMAT.format(new Date()) + " (" + level + ") " + message + "\n");
            if (t != null) {
                t.printStackTrace(logFileWriter);
            }
            logFileWriter.flush();
        }
    }
Returns compact info about caller of Log method. Note: this method is considerably slow
and shall be used with care (only when explicitely turned on)
main/src/main/java/cgeo/geocaching/utils/Log.java