Minor improvements in performance and code clarity.

Still no solution for the reset subroutine. It is really time
consumming.

src/modules/moduleInject.f95

@@ -178,6 +178,8 @@ MODULE moduleInject
 
         !Push new particle
         CALL push(part_inj(n))
+        !Assign cell to new particle
+        CALL mesh%vols(part_inj(n)%e_p)%obj%findCell(part_inj(n))
 
       END DO