db_management.cpp:  Only pop to last irreversible block, fix #407
db_management.cpp:  Only pop to last irreversible block, fix #407

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