mxf2raw: add --file-md5-only option to calc file's md5 and exit
mxf2raw: add --file-md5-only option to calc file's md5 and exit

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