Add the timing of the task number estimation to the runtime analysis script.

tools/analyse_runtime.py

@@ -61,6 +61,7 @@ labels = [
     "engine_recompute_displacement_constraint:",
     "engine_exchange_top_multipoles:",
     "updating particle counts",
+    "engine_estimate_nr_tasks:"
     "Making gravity tasks",
     "Making hydro tasks",
     "Splitting tasks",
@@ -121,6 +122,7 @@ is_rebuild = [
     1,
     1,
     1,
+    1,
     0,
     0,
     0,