use named fields to access node memory

copy list items when they are added to the list

changes off_t to ptrdiff_t

adds missing assignments for new list node

adds first draft for linked list implementation

removes unnecessary cx_allocator typedef

make cx_allocator_class shared

fixes missing CUnit include dir

high level allocator functions should be real functions, not macros

no C99 comments

(0) -300 -100 -10 +10 +100 +300 tip

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