mjpeg: Split off bits shared by MJPEG and LJPEG encoders

This obviates a dependency of the LJPEG encoder on mpegvideo.
dsputil: Split off IDCT bits into their own context
Update Fiona's name in copyright statements.
Merge commit 'adcb8392c9b185fd8a91a95fa256d15ab1432a30'

* commit 'adcb8392c9b185fd8a91a95fa256d15ab1432a30':
  mjpeg: Split off bits shared by MJPEG and LJPEG encoders

Conflicts:
	libavcodec/mjpegenc.c
	libavcodec/mjpegenc.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'e3fcb14347466095839c2a3c47ebecff02da891e'

* commit 'e3fcb14347466095839c2a3c47ebecff02da891e':
  dsputil: Split off IDCT bits into their own context

Conflicts:
	configure
	libavcodec/aic.c
	libavcodec/arm/Makefile
	libavcodec/arm/dsputil_init_arm.c
	libavcodec/arm/dsputil_init_armv6.c
	libavcodec/asvdec.c
	libavcodec/dnxhdenc.c
	libavcodec/dsputil.c
	libavcodec/dvdec.c
	libavcodec/dxva2_mpeg2.c
	libavcodec/intrax8.c
	libavcodec/mdec.c
	libavcodec/mjpegdec.c
	libavcodec/mjpegenc_common.h
	libavcodec/mpegvideo.c
	libavcodec/ppc/dsputil_altivec.h
	libavcodec/ppc/dsputil_ppc.c
	libavcodec/ppc/idctdsp.c
	libavcodec/x86/Makefile
	libavcodec/x86/dsputil_init.c
	libavcodec/x86/dsputil_mmx.c
	libavcodec/x86/dsputil_x86.h

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '79793f833784121d574454af4871866576c0749d'

* commit '79793f833784121d574454af4871866576c0749d':
  Update Fiona's name in copyright statements.

Merged-by: Michael Niedermayer <michaelni@gmx.at>