Add caktux's JS console helpers.

libqethereum/QEthereum.h

@@ -225,6 +225,8 @@ private:
 	frame->evaluateJavaScript("String.prototype.dec = function() { env.warn('THIS CALL IS DEPRECATED. USE eth.* INSTEAD.'); return eth.toDecimal(this) }"); \
 	frame->evaluateJavaScript("String.prototype.fix = function() { env.warn('THIS CALL IS DEPRECATED. USE eth.* INSTEAD.'); return eth.toFixed(this) }"); \
 	frame->evaluateJavaScript("String.prototype.sha3 = function() { env.warn('THIS CALL IS DEPRECATED. USE eth.* INSTEAD.'); return eth.sha3old(this) }"); \
+	frame->evaluateJavaScript("console.log = env.note"); \
+	frame->evaluateJavaScript("window.onerror = function (errorMsg, url, lineNumber, column, errorObj) { env.warn('Error: ' + errorMsg + ', Script: ' + url + ', Line: ' + lineNumber + ', Column: ' + column + ', StackTrace: ' + String(errorObj)) }"); \
 }
 
 template <unsigned N> inline boost::multiprecision::number<boost::multiprecision::cpp_int_backend<N * 8, N * 8, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>> toInt(QString const& _s)