RTJPEGEncodeNode and RTJPEGDecodeNode 
Info:
 - uses mmx-optimized, experimental, JPEG-decoding/encoding
   implemented in RTjpeg.c (see extra README for details)
 - supports only YUV-input/output-format
 - RTjpeg.c was modified to make it multihread-safe; it will be
   a nightmare to update the RTjpeg-code.
