Switched to standard C++ header files for pair lj/expand/coul/long in USER-MISC

   Contributing author: Trung Nguyen (Northwestern)

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#include <math.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <cmath>

#include <cstdio>

#include <cstdlib>

#include <cstring>

#include "pair_lj_expand_coul_long.h"

#include "atom.h"

#include "comm.h"