Added more control options to graphing window, updated version number

The graphing window now can be zoomed via the context menu or with the
+ and - keys. Also, you can reset to a "good" view of all the graphs
from the context menu.

flowviewwindow.cpp

@@ -87,14 +87,14 @@ FlowViewWindow::FlowViewWindow(const QVector<CANFrame> *frames, QWidget *parent)
     connect(ui->flowView, SIGNAL(customContextMenuRequested(QPoint)), this, SLOT(contextMenuRequestFlow(QPoint)));
 
     playbackTimer->setInterval(ui->spinPlayback->value()); //set the timer to the default value of the control
-
-    installEventFilter(this);
 }
 
 void FlowViewWindow::showEvent(QShowEvent* event)
 {
     QDialog::showEvent(event);
 
+    installEventFilter(this);
+
     readSettings();
 
     refreshIDList();
@@ -109,6 +109,8 @@ void FlowViewWindow::showEvent(QShowEvent* event)
 
 FlowViewWindow::~FlowViewWindow()
 {
+    removeEventFilter(this);
+
     delete ui;
 
     playbackTimer->stop();