check whether tx is ours. add walletconflicts if so.
comparator function. fix cwtx usage.
check is_mine differently.
potentially iterate all ldb values.
work on ldb iteration.
use CLevelDBWrapper.
leveldb does not like me.
more leveldb work: use chainstate db. use Params().GenesisBlock().
fix bad return for addr txs.
cleanup blockhash.