1. Changed descriptor allocators to distinguish between small/large
descriptors: large descriptors don't have GLOB_TO_LOC, and use an
AVL tree to keep track of indices while building, and a set of
sorted lists with a hash based on low order bits for assembled
descriptors.
2. Changed CDINS to use inner routines, hiding usage of GLOB_TO_LOC
vs. AVL tree. Added an option to return converted indices.
3. Changed SPINS to use the new version of CDINS with the converted
indices.
4. Changed xxINS to use new internals for selecting local indices.
5. Folded CDOVRBLD into CDOVR. Perhaps we can delede OVRBLD and rename
OVR into OVRBLD. While doing so, changed the implementation to
distinguish large vs small descriptors. Also changed to call cdasb
at the end, to minimize code rewriting.
Salvatore Filippone