restore option to request neighbor lists with neighbors of ghosts

unittest/force-styles/test_mliappy_unified.cpp

@@ -77,11 +77,6 @@ TEST(MliapUnified, VersusLJMelt)
     lammps_close(mliap);
 }
 
-#if 0
-
-// This setting was producing wrong results and leaking memory.
-// Thus support for it was removed from LAMMPS.
-
 TEST(MliapUnified, VersusLJMeltGhost)
 {
     const char *lmpargv[] = {"melt", "-log", "none", "-nocite"};
@@ -117,5 +112,4 @@ TEST(MliapUnified, VersusLJMeltGhost)
     lammps_close(ljmelt);
     lammps_close(mliap);
 }
-#endif
 } // namespace LAMMPS_NS