Remove PARANOID build option

[chfast]

Together with #define ETH_PARANOIA.

[moneroexamples]

Should entire blocks of code enclosed by #if ETH_PARANOIA also be removed? Or just the #if ETH_PARANOIA should be removed and the blocks be unattached? For example, should the following peace of code be fully removed?

aleth/libethereum/BlockChain.cpp

Lines 923 to 944 in be6ce38

	#if ETH_PARANOIA
	if (isKnown(_block.info.hash()) && !details(_block.info.hash()))
	{
	LOG(m_loggerError) << "Known block just inserted has no details.";
	LOG(m_loggerError) << "Block: " << _block.info;
	LOG(m_loggerError) << "DATABASE CORRUPTION: CRITICAL FAILURE";
	exit(-1);
	}
	try
	{
	State canary(_db, BaseState::Empty);
	canary.populateFromChain(*this, _block.info.hash());
	}
	catch (...)
	{
	LOG(m_loggerError) << "Failed to initialise State object form imported block.";
	LOG(m_loggerError) << "Block: " << _block.info;
	LOG(m_loggerError) << "DATABASE CORRUPTION: CRITICAL FAILURE";
	exit(-1);
	}
	#endif // ETH_PARANOIA