The new prefixes are
0: 15 bits of state are added to the base state.
10: 22 bits of state are added to the base state.
110: Reserved for super frame marker
111: 29 bits of state are added to the base state.

The likelihood of any final state is proportional to 1 / state. Given a
state range of [2**15, 2 **23) this should save on average 0.4 bits
per serialized final state.

BDRATE
subset1: -.000%
lowres: -.010%

Change-Id: I8e66e4a6667f5692c541083e6d6edc35ff411181