 DLA descriptors are implemented as arrays. In the CSPICE
   Toolkit, DLA descriptors are implemented by the structure SpiceDLADescr.
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   The DLA segment descriptor members are:
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<PRE>
   +---------------+
   | BACKWARD PTR  | Linked list backward pointer
   +---------------+
   | FORWARD PTR   | Linked list forward pointer
   +---------------+
   | BASE INT ADDR | Base DAS integer address
   +---------------+
   | INT COMP SIZE | Size of integer segment component
   +---------------+
   | BASE DP