build: Clean up Makefile.am

Remove INSTALL from aravisdoc_DATA.
 -- There is no point in installing instructions for installing the
    package.
Remove aravisdoc_DATA from EXTRA_DIST
 -- automake includes all of the files currently listed in the dist
    target by default.
gst: bugfix for Bayer8 images under GStreamer 1.0

Enable use of x-raw-bayer formats in GStreamer
1.0 with the aravissrc plugin. Without this fix, GStreamer will not
negotiate a pipeline due to invalid pixel formats.
news: file update
build: post-release version bump
build: add an appdata file for the viewer
build: use the screenshot image from git for appdata
build: make distcheck pass
build: build xz archives
misc: fix several compilation warnings

For some reason, unused variable, undeclared functions and printf
format mismatch warnings are not shown for gstreamer plugins and
tests.
build: avoid use of deprecated GSignalFlags
Ssshhh...
news: file update
build: post-release version bump
documentation: minor fixes
Revert "build: avoid use of deprecated GSignalFlags"

This reverts commit 8b056dd432f830c9fdb84b90ab69c0ff3ccf4d4c.

This patch make ref count warnings appear.
Mark strings in appdata file as translatable
Updated Polish translation
chunk: start of chunk parser class implementation
protocol: add missing packed structure declaration
buffer: chunk data accessor