[patch #5683] Add deque implemented as circular queue to libpspp

Update of patch #5683 (project pspp):

                  Status:   Ready For Test/Review => Works For Me           
             Assigned to:                     jmd => blp                    

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Follow-up Comment #1:

I prefer 
 assert (condition1);
 assert (condition2);

rather than assert (condition1 && condition2) simply because if the
assertion(s) ever fail, the former makes it instantly clear which condition
has been violated.  The latter requires extra investigation using the
debugger or something.


In NAME##_init, where you have written

 deque->capacity *= 2

I would have put

 deque->capacity <<= 1

I guess any half decent compiler would create the same code, but I think it
makes the intent clearer.

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