Clear historical issues.

mix/qml/LogsPane.qml

@@ -7,6 +7,11 @@ import org.ethereum.qml.SortFilterProxyModel 1.0
 Rectangle
 {
 	property variant currentStatus;
+	function clear()
+	{
+		logsModel.clear();
+	}
+
 	function push(_level, _type, _content)
 	{
 		_content = _content.replace(/\n/g, " ")

mix/qml/StatusPane.qml

@@ -77,7 +77,11 @@ Rectangle {
 
 	Connections {
 		target:clientModel
-		onRunStarted: infoMessage(qsTr("Running transactions..."), "Run");
+		onRunStarted:
+		{
+			logPane.clear()
+			infoMessage(qsTr("Running transactions..."), "Run");
+		}
 		onRunFailed: errorMessage(format(_message), "Run");
 		onRunComplete: infoMessage(qsTr("Run complete"), "Run");
 		onNewBlock: infoMessage(qsTr("New block created"), "State");