kmvc: use fixed sized arrays in the context

Avoid some boilerplate code to dynamically allocate and then free the
buffers.
kmvc: Clip pixel position to valid range

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
fifo: K&R formatting cosmetics
tools: Wording and formatting cosmetics
tests: Only run noproxy test if networking is enabled
avprobe: rename the prettyprint structures
wtv: Mark attachment with a negative stream id

A sid 0 would be mismatched to the attachment.

Prevent NULL pointer dereference.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Merge commit '8f689770548c86151071ef976cf9b6998ba21c2a'

* commit '8f689770548c86151071ef976cf9b6998ba21c2a':
  kmvc: use fixed sized arrays in the context

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '4e7f0b082d8c4b360312216b9241bec65ff63b35'

* commit '4e7f0b082d8c4b360312216b9241bec65ff63b35':
  kmvc: Clip pixel position to valid range

The added clip should make no difference, there are already checks for
the index.

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '6516632967da5e6bd7d6136e8678f826669ed26e'

* commit '6516632967da5e6bd7d6136e8678f826669ed26e':
  tests: Only run noproxy test if networking is enabled
  fifo: K&R formatting cosmetics

Conflicts:
	libavformat/Makefile
	libavutil/fifo.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'a4baf96abd64cda68e3e4692b182bdf60745a14d'

* commit 'a4baf96abd64cda68e3e4692b182bdf60745a14d':
  avprobe: rename the prettyprint structures
  tools: Wording and formatting cosmetics

Conflicts:
	avprobe.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  wtv: Mark attachment with a negative stream id

Conflicts:
	libavformat/wtv.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
avformat/Makefile: remove stray tab

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