Relay OP_RETURN data TxOut as standard transaction type

Conflicts:

	src/main.cpp
	src/test/transaction_tests.cpp
Remove tests for now
Move GetStakeEntropyBit() to main.cpp.
Check last 288 block index records at startup.
Make sure that new stake modifier meets fixed generation interval.
Merge pull request #11 from CryptoManiac/current

Merging of "current" branch