Add new checkpoints.
Allow free transactions
Force allowfree = false until 1 july 2014
Transactions fee handling

* Enable free user transactions since 1 July 2014;
* Force CENT as nMinTxFee and nMinRelayTxFee until 1 July 2014.
Allow new fees policy on testnet, adjust minimum fees
Don't notify old sync checkpoints anymore
Replace MIN_TX_FEE with CENT in change calculation
Translation fixes
Add input weight to coin control interface
Move importwallet and dumpwallet implementations to walletdb.cpp;
Move timestamps encoding and decoding functions to util.cpp.
Implement DumpWallet and ImportWallet calls from menu.
Translations update
Update transaction verification protocol

* CheckBlock() refactoring: move headers checking code to new CheckBlockHeader() and coinbase value checking code to ConnectBlock();
* Fix minimum stake fee at CENT.
Transactions verification update

* Don't count empty outputs in GetMinFee();
* CheckBlock(): allow coinbase timestamp drift for proof-of-work, disable coinbase timestamp checking and add nonce checking for proof-of-stake.
Stake miner status icon
Add miner icons
Translations update
Update stake miner GUI

* Remove suspend notification string from status bar;
* Force icon update after unlocking.
Create wallet security menu
Translations update