New transaction fees scheme

* Enable free user transactions since 1 July 2014;
* Force CENT as nMinTxFee and nMinRelayTxFee until 1 July 2014;
* minimum fees adjustments.
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
Transactions verification update

CheckBlock(): allow coinbase timestamp drift, 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.

Conflicts:

	src/main.cpp
	src/miner.cpp
Create wallet security menu
Translations update
Update translations
Unlock menu fix
Typo fix
Convert UI files to UNIX EOL format.
CoinControl: add paste from address book and clipboard buttons for custom change address, standard validation of custom change address.
Translations update
Relay OP_RETURN data TxOut as standard transaction type