Fix invalid handling of input filenames command line option; Print dot every second while sending messages to indicate activity

src/SyslogBulkUploader.cpp

@@ -34,6 +34,10 @@ void SyslogBulkUploader::run() {
 
     while (auto msg = _reader.nextMessage()) {
         freqLimit.tick();
+        if (_preSendCallback)
+            _preSendCallback(msg);
         _writer.sendMessage(msg);
+        if (_postSendCallback)
+            _postSendCallback(msg);
     }
 }