ext/annodex/: Add a little extra debug. Make the decoder not return NOT_LINKED, as we want to continue decoding all C...

Original commit message from CVS:
* ext/annodex/gstcmmldec.c: (gst_cmml_dec_sink_event),
(gst_cmml_dec_new_buffer), (gst_cmml_dec_parse_preamble),
(gst_cmml_dec_parse_head), (gst_cmml_dec_push_clip):
* ext/annodex/gstcmmlparser.c: (gst_cmml_parser_parse_chunk):
Add a little extra debug. Make the decoder not return NOT_LINKED,
as we want to continue decoding all CMML and emitting tags.