Commit [r3682] Maximize Restore History

Replaced RANS0 and RANS1 codec identifiers with a single RANS

codec. Internally we still call them RANS0 and RANS1 methods so it
can auto-tune to order-0 or order-1 in the statistics, but before
writing out we force both to be RANS/RANS0 identifier.

The rANS implementation has therefore added an extra byte (order) to
the data stream. I also tweaked the efficiency of decoding a bit more
so it's now faster.

jkbonfield 2014-06-25

changed /io_lib/trunk/io_lib/cram_io.c
changed /io_lib/trunk/io_lib/cram_structs.h
changed /io_lib/trunk/io_lib/rANS_static.c
/io_lib/trunk/io_lib/cram_io.c Diff Switch to side-by-side view
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/io_lib/trunk/io_lib/cram_structs.h Diff Switch to side-by-side view
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/io_lib/trunk/io_lib/rANS_static.c Diff Switch to side-by-side view
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