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Adds some API to handle memory blocks.

Conflicts:
	gst/gstbufferlist.c

See bug #644907.

Previously we were returning the peerpad, which is the target
of the ghostpad.

Adding a buffer to the end of a GstBufferList is supposed to be a fast
operation, but it was not since the iterator does not advance its
nextpointer when adding buffers and GList does not have a tail pointer.
Using a GQueue to store the buffers makes it easier to add buffers to
the end of the list and this operation will now be much more efficient.

Adding an entire GList of buffers using
gst_buffer_list_iterator_add_list() will however have to iterate over
the list being added to be able to update the tail pointer in the
GQueue.

GST_DISABLE_DEPRECATED should only affect visibility of declarations in headers,
not actually remove symbols. See GitDeveloperGuidelines and DeprecatingAPI
pages in wiki.

https://bugzilla.gnome.org/show_bug.cgi?id=402141

Add new functions to clarify how the caps are compared to the template caps of
the element factory. Improve the docs to point out the difference.

Deprecate: gst_element_factory_can_{src|sink}_caps
API: add gst_element_factory_can_{src|sink}_{any|all}_capps

https://bugzilla.gnome.org/show_bug.cgi?id=402141

Add a test for the crash in bug #642271.

Replace subbuffer and copy vmethods by a more generic transform function that
can then be parametrised by transform specific data. This should allow us to
implement make-writable and more future transform functions.

Move one test from gstelement suite.

No need to check for media_type!=NULL as the function we call that actual create
the structure does a full check anyway.

Check if structure has been created before appending it to the caps. Free the
caps in the case of an error to not conceal it be returning empty caps.

Fixes #642271

Our helloworld example thatw e reference from the manual has been a bit
complicated to serve a first contact with gstreamer. Since we have and
promote playbin2 as a playback api use it here.

Based on work from Mathias Hasselmann <mathias.hasselmann@gmx.de>

Fixes #424143

Now that we don't subclass buffers anymore, the FIXME about limited
functionality of the copy function is irrelevant.

Move the preroll lock to basesink where it belongs.

Add the caps to the configuration parameters of the pool.
Initialize the private data

Use the dispose method to release the buffer to the pool when it is configured.

Keep a pointer to the bufferpool. Release the buffer to the pool when
finalizing. Make sure the pool sets itself as the pool member of buffers that it
sends out.