decoder), declared a few things static

indexing of the pitch code for stereo

and bit-stream version

now that we no longer do normalized pitch

tonal artefacts. This replaces folding for all cases where we have at least
one pulse.

bit before the rate is decided (otherwise they'll end up at the wrong place)
and we have to shrink the byte buffer before writing raw bits.

original ec_encode_bin()/ec_decode_bin() to optimize performance when ft is
a power of two.

Making it so all the information encoded directly with ec_enc_bits() gets
stored at the end of the stream, without going through the range coder. This
should be both faster and reduce the effects of bit errors.

Conflicts:

	tests/ectest.c

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).

possible

Conflicts:

	libcelt/celt.c