Check all clusters in cell when building neighbor lists because ghost clusters may not be sorted

Signed-off-by: Rafael Ravedutti <rafaelravedutti@gmail.com>

gromacs/includes/util.h

@@ -32,6 +32,11 @@
 #ifndef ABS
 #define ABS(a) ((a) >= 0 ? (a) : -(a))
 #endif
+#ifdef DEBUG
+#define DEBUG_MESSAGE(msg)  printf
+#else
+#define DEBUG_MESSAGE(msg)
+#endif
 
 #define FF_LJ   0
 #define FF_EAM  1