TODO-namecoin

* drop transactions that cannot be accepted because of a name conflict
  * name_clean additional review
  * name_clean on name_update (but that should have happened anyway?)
  * tx can linger in memory on other nodes - move conflict check to CheckTransaction?
  * other conflicts: update on expired name, firstupdate on expired name_new
* d7cc9e949d invalid number of args
* blockexplorer
* IsMine hook to ensure modified clients don't spend namecoins by mistake as regular coins in case of future changes to IsMine
* listtransactions improved decode
* auto-send firstupdate after 6 blocks with persistent name/rand
* review threading
* sideloading resolver library
* reference DNS server
* cross-mining

Bugs

* CWalletTx::GetAmounts nFee is off by 0.01 for name txs because IsMine is false on the name output
* Reports of crashes, bdb was mentioned