Original commit message from CVS:
* gst/pygstexception.c: (element_not_found_error_init),
(pygst_exceptions_register_classes):
* gst/pygstexception.h:
gst.element_factory_make should raise ElementNotFoundError.
Subclass it from PluginNotFoundError so we can add it compatibly
and remove the wrong one later.
* gst/gstelementfactory.override:
raise ElementNotFoundError
Original commit message from CVS:
* gst/gstelement.override:
* gst/pygstexception.c:
* gst/pygstexception.h:
* testsuite/test_element.py:
add gst.QueryError and use it
* testsuite/test_pad.py:
add some tests that show comparison between two different
Python objects wrapping the same MiniObject
