also another stereo bug fixed for static-array ncwrs64().

giving a (minor) speedup. Also fixed optional memory-based ncwrs64().

statis memory allocation (not enabled by default)

the "effective gain" too high (>10 dB).

Also fixed a bug that was exposed by the change (and removed some warnings)

prediction

pre-computed (instead of computing tons of pow() uselessly all the time)

do anything yet.

Code much leaner now.

"inverse" flag from the state so it can be shared between the forward and
inverse transforms.

used anywhere yet).

entropy coder. All testcases pass again.

with the entropy coder.

bitrate defaults.

Also, added an Ogg encoder (doesn't work quite yet).