Rvision 0.6.0

New features

• We now have a changelog (yes, I know, finally).
• A large portion of the code base has been rewritten for improving performance
  and facilitating code maintenance (hopefully).
• In-place operations have been reworked to allow for saving results in target
  images for more flexibility while maintaining performance.
• GPU support has been added wherever possible. Stupid-fast mode enabled on
  compatible hardware :-)
• An experimental dynamic queuing system operating on a separate thread has been
  introduced to allow for reading frames in parallel with image processing on the
  main R thread.
• New, hopefully more useful vignettes have been added.
• More OpenCV functions are now accessible through Rvision (e.g., histogram
  equalization).

Minor improvements and fixes

• The documentation has been fixed/improved in several places.
• Minor bug fixes here and there.

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