Adjust valgrind mode to insert padding between every allocation to increase sensitivity.

Correct an out of bounds access in this case.

Add some paranoid validation to the header functions.

and remove some dead code from bands.c.

side effects of "continue" statements.

of bands as criterion for auto-intra disabling.

intra energy for low bitrates, and a bit of very high bitrate tuning

channels. Fixed two stereo bugs in the process: one in the handling of
mdct_weight_shift and one in the PLC.

de-interleaved