block_tests.cpp:  Remove logspam, fix compiler warnings
block_tests.cpp:  Remove logspam, fix compiler warnings

bitshares/bitshares-2,oxarbitrage/bitshares-core,peertracksinc/muse,bitshares/bitshares-2,oxarbitrage/bitshares-core,pmconrad/graphene,cryptonomex/graphene,pmconrad/graphene,peertracksinc/muse,abitmore/bitshares-2,bitsuperlab/cpp-play2,bigoc/openchain,pmconrad/graphene,abitmore/bitshares-2,abitmore/bitshares-2,bigoc/openchain,peertracksinc/muse,pmconrad/graphene,bitsuperlab/cpp-play2,peertracksinc/muse,bigoc/openchain,bitshares/bitshares-2,oxarbitrage/bitshares-core,oxarbitrage/bitshares-core,bigoc/openchain,abitmore/bitshares-2,cryptonomex/graphene,bitsuperlab/cpp-play2,bitshares/bitshares-2,cryptonomex/graphene