[patch #5841] Implement "tower" data structure

[Ben Pfaff]

Follow-up Comment #2, patch #5841 (project pspp):

That's right.  The client code is responsible for all memory management. 
Although this makes some things slightly harder (specifically, you have to go
through a <structure>_data macro to get from a node to client data), it
reduces the number of needed calls to malloc and friends, reduces the amount
of space overhead, and makes it easy to determine the node associated with
given client data.

The tradeoffs are covered fairly well in the big comment at the top of
src/libpspp/ll.h.

Thanks for the reviews.

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