remove ti_sort.

tests/test125cells.c

@@ -336,7 +336,6 @@ struct cell *make_cell(size_t n, const double offset[3], double size, double h,
   cell->ti_old_part = 8;
   cell->ti_end_min = 8;
   cell->ti_end_max = 8;
-  cell->ti_sort = 0;
 
   // shuffle_particles(cell->parts, cell->count);
 

tests/test27cells.c

@@ -174,7 +174,6 @@ struct cell *make_cell(size_t n, double *offset, double size, double h,
   cell->ti_old_part = 8;
   cell->ti_end_min = 8;
   cell->ti_end_max = 8;
-  cell->ti_sort = 8;
 
   shuffle_particles(cell->parts, cell->count);
 

tests/testPeriodicBC.c

@@ -173,7 +173,6 @@ struct cell *make_cell(size_t n, double *offset, double size, double h,
   cell->ti_old_part = 8;
   cell->ti_end_min = 8;
   cell->ti_end_max = 8;
-  cell->ti_sort = 8;
 
   shuffle_particles(cell->parts, cell->count);