Add specialization of SipHash for 256 + 32 bit data
Add specialization of SipHash for 256 + 32 bit data

We'll need a version of SipHash for tuples of 256 bits and 32 bits
data, when CCoinsViewCache switches from using txids to COutPoints as
keys.

Conflicts:
	src/hash.h
	src/test/hash_tests.cpp

chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin,chaincoin/chaincoin