Fix build of dcdbquerysum with namespace DCDB.

DCDBTools/dcdbquerysum/dcdbquerysum.cpp

@@ -63,10 +63,10 @@ int main(int argc, char* argv[]) {
   }
 
   /* Try to create TimeStamp objects from the arguments */
-  TimeStamp start, end;
+  DCDB::TimeStamp start, end;
   try {
-      start = TimeStamp(argv[argc-2], localtime);
-      end   = TimeStamp(argv[argc-1], localtime);
+      start = DCDB::TimeStamp(argv[argc-2], localtime);
+      end   = DCDB::TimeStamp(argv[argc-1], localtime);
   }
   catch (std::exception& e) {
       std::cout << "Wrong time format." << std::endl;