We can not expect a seek event anymore as we are seeking in READY the elements
themselves
+remove actual sinks
Co-Authored by: Thibault Saunier <tsaunier@gnome.org>
Starting from now we will not claim that we support GnlObject that have
several source pads as this is
1- Not true at all;
2- the design of priorities in the GnlComposition tree does not allow that;
3- Not very useful in most of the cases and it complexifies quite a lot the code
in the composition.
Conflicts:
configure.ac
tests/check/Makefile.am
