Add missing iomanip include (reported by clang)

src/utils/checkpointing/PrintCheckpointInfo.cpp

@@ -13,8 +13,10 @@
 #include <algebra/TinyMatrix.hpp>
 #include <algebra/TinyVector.hpp>
 
+#include <iomanip>
 #include <iostream>
 #include <regex>
+
 #endif   // PUGS_HAS_HDF5
 
 #ifdef PUGS_HAS_HDF5