some more include file cleanup.

include cstdlib where functions like atoi() are used
remove unneeded include statements from headers

src/PYTHON/python_impl.cpp

@@ -15,6 +15,7 @@
    Contributing author: Richard Berger and Axel Kohlmeyer (Temple U)
 ------------------------------------------------------------------------- */
 
+#include <cstdlib>
 #include <Python.h>
 #include "lmppython.h"
 #include "force.h"

src/USER-MEAMC/meam.h

@@ -3,7 +3,6 @@
 
 #include "memory.h"
 #include <cmath>
-#include <cstdlib>
 
 #define maxelt 5
 

src/compute_reduce_chunk.cpp

@@ -12,7 +12,8 @@
 ------------------------------------------------------------------------- */
 
 #include <mpi.h>
-#include <string.h>
+#include <cstring>
+#include <cstdlib>
 #include "compute_reduce_chunk.h"
 #include "atom.h"
 #include "update.h"

src/fix_vector.cpp

@@ -11,6 +11,7 @@
    See the README file in the top-level LAMMPS directory.
 ------------------------------------------------------------------------- */
 
+#include <cstdlib>
 #include <cstring>
 #include "fix_vector.h"
 #include "update.h"

src/lammps.cpp

@@ -13,6 +13,7 @@
 
 #include <mpi.h>
 #include <cstring>
+#include <cstdlib>
 #include <cctype>
 #include <map>
 #include <string>

src/variable.cpp

@@ -26,6 +26,7 @@
 #include "region.h"
 #include "modify.h"
 #include "compute.h"
+#include "input.h"
 #include "fix.h"
 #include "fix_store.h"
 #include "force.h"