0.13 is segwit code. To remain neutral to both strands of development (ie rat4 is still maintaining a client and may have other plans this summer), the codebase was brought up to 0.12 which allows for loads of other stuff but doesn't automatically assume a political position re:segwit etc.
Very professional to take a distance in this messy debate and simply work with both ends. Whoever wins.
Blackcoin holds no stake in this issue. We have a stake in something else
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