bugfix: support multiple delimitor.

src/extractor/raster_source.cpp

@@ -124,7 +124,13 @@ int RasterContainer::LoadRasterSource(const std::string &path_string,
     LoadedSources.push_back(std::move(source));
 
     util::Log() << "[source loader] ok, after " << TIMER_SEC(loading_source) << "s";
-
+/*
+    // for debug : list up all keys and values
+    util::Log() << "Num of Raster Sources : " << LoadedSourcePaths.size();
+    for (auto i = LoadedSourcePaths.begin(); i != LoadedSourcePaths.end(); ++i) {
+        util::Log() << "Key : " << i->first << " Value: " << i->second;
+    }
+*/
     return source_id;
 }