More re-ordering.

include/program_args/arguments.h

@@ -29,16 +29,16 @@ private:
 private:
   // Metadata variables
   bool primed_{false};
-  std::map<std::string, std::string> option_descriptions;
   std::map<std::string, std::string> argument_descriptions;
-  std::map<std::string, std::string> option_name_mapping;
   std::map<size_t, std::string> argument_names;
+  std::map<std::string, std::string> option_descriptions;
+  std::map<std::string, std::string> option_name_mapping;
 
-  // Data variables
+  // Data/Output variables
   std::string program;
   size_t optional_from{std::numeric_limits<size_t>::max()};
-  std::map<std::string, std::vector<std::string>> options;
   std::vector<std::string> arguments;
+  std::map<std::string, std::vector<std::string>> options;
 };
 
 template <typename Impl> struct Arguments<Impl>::Argument {