raw2bmx: allow user choice for avid avci header inclusion
raw2bmx: allow user choice for avid avci header inclusion

The same options, '--allow-no-avci-head' and '--force-no-avci-head',
were added to bmxtranswrap in c84da659

stuarthicks/bmx,Limecraft/ebu-bmx,ebu/ebu-bmx,ebu/ebu-bmx,kierank/bmxlib-bmx,xunchangguo/BMX,kierank/bmxlib-bmx,ebu/ebu-bmx,stuarthicks/bmx,stuarthicks/bmx,xunchangguo/BMX,kierank/bmxlib-bmx,Limecraft/ebu-bmx,Limecraft/ebu-bmx,xunchangguo/BMX