use lagrange multipler instead of qp for ratecontrol, this may break some things, tell me ASAP if u notice anything broken
quality which was 1..31 float is now a 1..FF_LAMBDA_MAX int, and FF_QP2LAMBDA * qp can be used to convert to the new range


git-svn-id: file:///var/local/repositories/ffmpeg/trunk@2348 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b