Fold the leftover formatters into the SI ones and stop reallocating the draw scratch

main_test.go

@@ -26,8 +26,8 @@ func TestResetDoesNotUnderflowTotals(t *testing.T) {
 	if v.rxFrames != 0 {
 		t.Errorf("rxFrames = %d, want 0", v.rxFrames)
 	}
-	if v.rxGot != 0 {
-		t.Errorf("rxGot = %d, want 0", v.rxGot)
+	if v.rxBytes != 0 {
+		t.Errorf("rxBytes = %d, want 0", v.rxBytes)
 	}
 
 	// The rolling window and the rates are about now rather than since the