Instead of trying to maximize the number of trailing zeros (minimize the number
of bits encoded), we try to maximize the number of trailing bits that can
contain arbitrary data.
Note that this requires ec_enc_tell() and ec_dec_tell() to reserve an extra
bit, since depending on the exact final codeword, as little as half the final
range might be available for storing arbitrary data.
This is the first step needed to start packing literal bits outside the range
coder (for speed and robustness purposes).
