gst: init taglist gtype to use it in gstvalue

Otherwise it will have a 0 value and GstTagList won't be found
for GstValue functions (serialization/deserialization)

https://bugzilla.gnome.org/show_bug.cgi?id=733131
debugutils: Unref pad template after use

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=733121
typefindelement: Propagate input buffer PTS and DTS

The initial buffers (that were used for timestamping) might have PTS
and DTS set. In order to forward those properly, get the initial
PTS/DTS from the adapter and set them on the reconstructed output
buffer.

https://bugzilla.gnome.org/show_bug.cgi?id=733291
baseparse: Return FLOW_FLUSHING when pushing a frame on a pad that has been flushed

When going to READY, it is possible that we are still pusing a frame but that
our srcpad has already been set to flushing. In that case we should not
post any error on the bus but instead cleanly return FLOW_FLUSHING.

https://bugzilla.gnome.org/show_bug.cgi?id=733320
po: Update translations
Update .po files
Release 1.4.0
Back to development
elements: improve buffer flags to string utility function

Avoid relocations and refactor so that we don't calculate
the fixed and known at compile time maximum string size
every time. Also skip the mini object flags which we are
not going to print anyway.
pipeline: Reset start time in READY->PAUSED before chaining up

Otherwise bin will change the state of the child elements without
distributing the new start time.
pipeline: Reset the start time when going from PAUSED to READY too
pipeline: Add unit test for resetting of the start time

Also check if this properly affects basesink elements to not
report the old start time but the real current position when
setting to PAUSED again.
funnel: Fix for racy EOS event handling

When eos events are forwarded simultaneouly from two sinkpads on
funnel, it doesnot forward the eos to sourcepad. The reason is
sticky events are stored after the event callbacks are returned.
Therefore while one is about to store the sticky events on the its
sinkpad, other sinkpad starts checking for the eos events on all other
sinkpads and assumes eos is not present yet.

https://bugzilla.gnome.org/show_bug.cgi?id=732851
gstvalue: add GstTagList compare function

When serializing GstStructures from events in GDP it will add a taglist
as a GstStructure field, having the compare function allows comparison of
GstStructures to check if the serialized/deserialized version matches the
original one, among other cases.

https://bugzilla.gnome.org/show_bug.cgi?id=733131
tests: gststructure: serialization of tag event structure

Adds a test that checks that the serialization of a tag event structure
works without problems

https://bugzilla.gnome.org/show_bug.cgi?id=733131
tests: taglist: add basic test for taglists serialization

Make sure it works with empty taglists
tests: tag: add the empty taglist serialization test

Adds the test to the appropriate and already existing file.
Revert "tests: taglist: add basic test for taglists serialization"

This reverts commit 85d23d19b7de40541d63b0bc76d8b646c321af26.

There was already a gsttag.c tests file, this test has been merged
in it in the previous commit
scripts: Use git pull --rebase

No point introducing redundant merge commits.
private: allow internal access to the debug base-time

Moving the extern to the head lets us access this from other parts as well. This
is neeed in the tracer branch.