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Additional blending modes are often requested.
A blending mode which is often requested is premultiplied alpha (which would come with a sf::Image::convertToPremultipliedAlpha function).
Implemented a more flexible blending system (fixes #298)
A possible API is discussed in the forum, please refer to this thread (don't discuss here):http://en.sfml-dev.org/forums/index.php?topic=14148
Created branch for experimental blending mode API
See issue #298.
Based on branch 'new_blending_api' of github.com:tomgalvin594/SFML.