NNLO matching functions for FFs

Classes
class	apfel::C2nspff
	The O(αs2) quark-quark matching function for FFs (references: https://arxiv.org/pdf/1604.07869.pdf and https://arxiv.org/pdf/1706.01473.pdf). More...
class	apfel::C2nsmff
	The O(αs2) quark-antiquark matching function for FFs (references: https://arxiv.org/pdf/1604.07869.pdf and https://arxiv.org/pdf/1706.01473.pdf). More...
class	apfel::C2psff
	The O(αs2) pure-singlet matching function for FFs (references: https://arxiv.org/pdf/1604.07869.pdf and https://arxiv.org/pdf/1706.01473.pdf). More...
class	apfel::C2qgff
	The O(αs2) quark-gluon matching function for FFs (references: https://arxiv.org/pdf/1604.07869.pdf and https://arxiv.org/pdf/1706.01473.pdf). More...
class	apfel::C2gqff
	The O(αs2) gluon-quark matching function for FFs (references: https://arxiv.org/pdf/1604.07869.pdf and https://arxiv.org/pdf/1706.01473.pdf). More...
class	apfel::C2ggff
	The O(αs2) gluon-gluon matching function for FFs (references: https://arxiv.org/pdf/1604.07869.pdf and https://arxiv.org/pdf/1706.01473.pdf). More...

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