facedetect: faceblur: update launch line examples

Reflect 1.0 and more useful examples
faceblur: post message when profile loading fails
faceblur: facedetect: add properties to faceblur

Makes faceblur have the same properties as facedetect. Also improves
the standard defaults and makes them the same in the 2 elements
glmemory: use GstVideoInfo everywhere

Simplifies a lot of the calling code

https://bugzilla.gnome.org/show_bug.cgi?id=733717
glmemory: use the plane offsets to compute the size of the data pointer

Certain elements expect that there be a certain number of lines
that they can write into.  e.g. for odd heights, I420, YV12, NV12,
NV21 (and others) Y lines are expected to have exactly twice the
number of U/UV lines.

https://bugzilla.gnome.org/show_bug.cgi?id=733717
gl/x11: silence runtime warning

g_main_loop_quit: assertion 'loop != NULL' failed
glcontext: add a destroy function

that just calls the subclass
Makefile: Add usage of build-checks step

Allows building checks without running them
gl/tests: update for API changes
gl: document GST_GL_* environment variables

https://bugzilla.gnome.org/show_bug.cgi?id=733245
gl/docs: remove superflous 'the'
decklink: 59.94fps is 60000/1001, not 30000/1001

And also change 30/1 to 60/1 for one 60fps mode.
po: Remove files no longer present

They were removed when sndfile was ported to 1.x
mpegtspacketizer: avoid timestamp overflows

Cause timing to break in the pipeline that can lead to a stall

https://bugzilla.gnome.org/show_bug.cgi?id=733837
dashdemux: return the error to the source immediately to stop faster

When flushing, this will prevent dashdemux from trying to download more
fragments or more chunks of the same fragment before stopping.

Also improves the error handling to not transform everything non-ok into
an error.

https://bugzilla.gnome.org/show_bug.cgi?id=734014
decklinksink: Catch errors during data flow and error out properly

Otherwise we will just deadlock the thread if e.g. scheduling a video
frame fails for whatever reason.
codecparsers_h264: initialize some fields of pic_timing structure

Otherwise pic timing structure can have invalid cpb_removal_delay,
dpb_output_delay or pic_struct_present_flag which are blindly retrieved
in h264parse.

https://bugzilla.gnome.org/show_bug.cgi?id=734124
decklinksink: Initialize pixel format to bmdFormat8BitYUV

https://bugzilla.gnome.org/show_bug.cgi?id=725871
dvbsrc: remove srcpad leftover

The element is inheriting its srcpad from basesrc
mpegtspacketizer: Convert PCR times to GStreamer times before comparing them against 500 * GST_MSECOND

Otherwise it will believe to detect PCR gaps already when there's a very small
gap of a few milliseconds, breaking playback of some files.