LPE padding for P frames
check if vectors must be clipped to fit in extended region
	* yes, check half pel clipping
	* no, check we code the min diff / prediction
check color compensation

Bugfixes
========

 - Use an accurate MMX iDCT

Features
========

 - full search motion estimation
 - finish dquant support
 - add B frame support
 - add shape motion compensation
 - add inter shape syntax

Optimizations
=============

 - improve shape coder
 - improve padding / use MMX
