* include/video.h, include/vlc_config.h, src/video_output/*: changed the picture buffer allocation scheme to allocate pictures from the render heap in a clockwise fashion instead of always picking the first available one from the start of the heap. This allows us to benefit from ffmpeg's macro-block skipping feature. As a side effect, we also have less chance of reusing a refrence picture buffer when we can't link/unlink them. * modules/codec/ffmpeg/video.c: modified the direct rendering code to benefit from the macro-block skipping algorithm. A new flag has also been introduced in the video_output's render heap to forbid modifications to the render picture buffers (for instance to overlay subtitles).
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