This is the destructor method for instances of the aList object.
It frees the memory used by the aList. Be sure to use it when you
are finished with an instance of a aList. Failure to destroy unused
aLists will result in memory leaks.
aList a pointer to the aList (structure of type aList)
This function returns:
Use of this class requires the following header files:
create_aList() the constructor for instances of the aList class