fix blockchain rescan bug, clear unconfirmedTransactions on rescan
fix blockchain rescan bug, clear unconfirmedTransactions on rescan

dmkaplan2000/nxt_dmk,duckx/nxt,metrospark/czarcraft,Ziftr/nxt,duckx/nxt,fimkrypto/nxt,dmkaplan2000/nxt_dmk,duckx/nxt,Ziftr/nxt,fimkrypto/nxt,metrospark/czarcraft,fimkrypto/nxt,metrospark/czarcraft,dmkaplan2000/nxt_dmk,fimkrypto/nxt,Ziftr/nxt