add av_dv_codec_profile2 : uses framerate to select best matching profile. default on first matching profile

Signed-off-by: Steve Jiekak <devaureshy@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
replaced av_dv_codec_profile by av_dv_codec_profile2 in encoder and dv muxers

Signed-off-by: Steve Jiekak <devaureshy@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>