Facility to check for ids.

Less tracing.

libethcore/BlockInfo.cpp

@@ -103,7 +103,6 @@ void BlockInfo::populateFromHeader(RLP const& _header, bool _checkNonce)
 	}
 
 	// check it hashes according to proof of work or that it's the genesis block.
-	cnote << "Verifying" << headerHashWithoutNonce().abridged() << nonce.abridged() << difficulty;
 	if (_checkNonce && parentHash && !ProofOfWork::verify(headerHashWithoutNonce(), nonce, difficulty))
 		BOOST_THROW_EXCEPTION(InvalidBlockNonce(headerHashWithoutNonce(), nonce, difficulty));
 

libqethereum/QEthereum.h

@@ -259,6 +259,7 @@ public:
 	Q_INVOKABLE void doPost(QString _json);
 
 	Q_INVOKABLE QString newIdentity();
+	Q_INVOKABLE bool haveIdentity(QString _id) { return m_ids.count(toPublic(_id)); }
 
 	Q_INVOKABLE QString newGroup(QString _id, QString _who);
 	Q_INVOKABLE QString addToGroup(QString _group, QString _who);