gst/deinterlace2/gstdeinterlace2.*: Include latency of the method in the returned...

gst/deinterlace2/gstdeinterlace2.*: Include latency of the method in the returned latency.

Original commit message from CVS:
* gst/deinterlace2/gstdeinterlace2.c:
(gst_deinterlace_method_get_latency),
(gst_deinterlace2_set_method), (gst_deinterlace2_class_init),
(gst_deinterlace2_push_history), (gst_deinterlace2_chain),
(gst_deinterlace2_setcaps), (gst_deinterlace2_src_query):
* gst/deinterlace2/gstdeinterlace2.h:
Include latency of the method in the returned latency.
Fix outputting of all fields, i.e. doubling of the framerate.