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gui and adjustments

wallet: fix boost::get usage with boost 1.58

Backport from master

miner?????

Add the 'timestamp' RPC command that can be used to construct OP_RETURN
transactions attesting to the existence of a certain 32-byte (SHA256)
hash of user data.  Also includes a brief how-to for using the command
line in doing that.

Conflicts:
	.gitignore
	src/Makefile.am
	src/chainparams.cpp
	src/chainparams.h
	src/main.cpp
	src/main.h
	src/miner.cpp
	src/rpcserver.cpp
	src/rpcserver.h
	src/txdb.cpp

Change cost of name registrations to the one decided by the Crowncoin
team.  Names with 1-100 characters are allowed, with a varying cost.

This is, basically, the patch developed also for Isracoin with only
minor modifications.  Adaption and testing still needs to be done.

Implement CBlockIndex::GetBlockHeader for auxpow block headers.  In this
case, load the header from disk.  Add a function to do that (as opposed
to reading the full block).

Update the regtest genesis block nonce to yield a valid block hash.  Fix
the resulting hash as checkpoint and with assert.

Not yet very well tested, and still missing getauxblock.  But it still
accepts the existing blockchain, which is a good start. :)