* Removed the '--audio-bitmode=' switch in 'src/glasscoder.cpp',
	'src/glasscoder.h', 'src/codec.cpp' and 'src/codec.h'.
	* Removed the '-d' switch in 'src/glasscoder.cpp'.
	* Added support for VBR encoding in 'src/mpeg3codec.cpp' and
	'src/mpeg3codec.h'.
	* Added support for VBR encoding in 'src/mpeg2codec.cpp' and
	'src/mpeg2codec.h'.
	* Added support for VBR encoding in 'src/aaccodec.cpp' and
	'src/aaccodec.h'.