Merge remote-tracking branch 'qatar/master'

Merge remote-tracking branch 'qatar/master'

* qatar/master:
  vp6: Fix illegal read.
  avfilter: Don't copy garbage from the stack when setting up video pictures.
  avcodec: Make sure codec_type is set by avcodec_get_context_defaults2
  avcodec: Remove a misplaced and useless attribute_deprecated
  avconv: add -dump_attachment option.
  avconv: add -attach option.
  avconv: make negative mappings disable only streams from the specified file
  fmtconvert: fix int32_to_float_fmul_scalar() for windows x86_64

Conflicts:
	libavcodec/options.c

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