json_spirit: #include <stdint.h>
switch from boost int types to <stdint.h>

Conflicts:
	src/rpcblockchain.cpp
	src/rpcclient.cpp
	src/rpcmining.cpp
	src/rpcmisc.cpp
	src/rpcnet.cpp
	src/rpcrawtransaction.cpp
	src/rpcwallet.cpp
schedule hardfork
new block timestamp limits

past: time of last block
future: +15 seconds
change block time from 60 to 64 seconds
new stake protocol
block version 7

use double sha256 instead of scrypt for block hash
using scrypt provides no advantage and is orders of magnitude slower
adapt stake miner to new protocol
adapt GetStakeWeight() to new protocol
adapt GetPoSKernelPS() to new protocol
force testnet