DEFINITION - SUB
    AddHead list&, node& -- insert a (Min)ListNode& at the head of a list

OPERATION
    Add a (Min)ListNode& to the head of a doubly linked list.

ARGUMENTS
    list& -- pointer to the target (Min)ListHeader& 
    node& -- pointer to the (Min)ListNode& to insert at head

SEE ALSO
    Special Case Insertion

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