Add cstdint include

parallel_manager/include/cpp_tools/parallel_manager/mpi.hpp

 #ifndef CPP_TOOLS_PARALLEL_MANAGER_MPI_HPP
 #define CPP_TOOLS_PARALLEL_MANAGER_MPI_HPP
 
-#include "mpi.h"
-#include "cpp_tools/parallel_manager/parallel_manager.hpp"
-#include "cpp_tools/parallel_manager/utils.hpp"
-
 #include <algorithm>
-#include <memory>
+#include <cstdint>
+// #include <memory>
 #include <ostream>
 
+#include "cpp_tools/parallel_manager/parallel_manager.hpp"
+#include "cpp_tools/parallel_manager/utils.hpp"
+#include "mpi.h"
+
 /**
  * \brief Simple MPI wrapper for idiomatic C++
  *