Removed iostream import

Leftover from debugging output

src/MISC/fix_ipi.cpp

@@ -30,7 +30,6 @@
 #include "update.h"
 
 #include <cstring>
-#include <iostream>
 
 using namespace LAMMPS_NS;
 using namespace FixConst;
@@ -514,4 +513,4 @@ void FixIPI::final_integrate()
   }
 
   hasdata=0;
-}
+}