Improve Ada.Containers.Indefinite_Doubly_Linked_Lists and Limited_Doubly_Linked_Lists in allocating elements
Improve Ada.Containers.Vectors.Insert and Insert_Space using Position instead of Before
Fix Ada.Formatting.Integer_Image not to use abs because compiler warns for Natural
Improve Ada.Containers.Indefinite_Ordered_Sets and Limited_Ordered_Sets in allocating elements