changed error message (file not parsed completely) in dm3 import to info message

If a dm3 file is not parsed completely this is no error but just an indication that there is more meta data stored in the file.

modules/io/src/img/map_io_dm3_handler.cc

@@ -238,7 +238,7 @@ void DM3Collector::ParseStream(std::istream& fp)
   parse_tag_group(0,"ROOT",fp);
   img::Progress::Instance().DeRegister(this);
   if(fp.eof()==0) {
-    LOG_ERROR("file not parsed completely");
+    LOG_INFO("file not parsed completely");
   } else {
     LOG_INFO("file parsed completely");
   }