Removed the (unused) sub-self and sub-pair gravity tasks

src/runner.c

@@ -1895,10 +1895,6 @@ void *runner_main(void *data) {
 #endif
           else if (t->subtype == task_subtype_force)
             runner_dosub_self2_force(r, ci, 1);
-          else if (t->subtype == task_subtype_grav)
-            runner_dosub_grav(r, ci, cj, 1);
-          else if (t->subtype == task_subtype_external_grav)
-            runner_do_grav_external(r, ci, 1);
           else
             error("Unknown/invalid task subtype (%d).", t->subtype);
           break;
@@ -1912,8 +1908,6 @@ void *runner_main(void *data) {
 #endif
           else if (t->subtype == task_subtype_force)
             runner_dosub_pair2_force(r, ci, cj, t->flags, 1);
-          else if (t->subtype == task_subtype_grav)
-            runner_dosub_grav(r, ci, cj, 1);
           else
             error("Unknown/invalid task subtype (%d).", t->subtype);
           break;

src/runner_doiact_grav.h

@@ -1067,20 +1067,6 @@ void runner_doself_grav(struct runner *r, struct cell *c, int gettimer) {
   if (gettimer) TIMER_TOC(timer_dosub_self_grav);
 }
 
-void runner_dosub_grav(struct runner *r, struct cell *ci, struct cell *cj,
-                       int timer) {
-
-  /* Is this a single cell? */
-  if (cj == NULL) {
-
-    runner_doself_grav(r, ci, 1);
-
-  } else {
-
-    runner_dopair_grav(r, ci, cj, 1);
-  }
-}
-
 /**
  * @brief Performs all M-M interactions between a given top-level cell and all
  * the other top-levels that are far enough.