Fixes for many issues in flowview, graphing window, and frame playback.

In FlowView:
- Drastically improved functionality of live mode. It actually works now
- Fixed several crash bugs
- Program didn't used to pick up new frames properly. This is now corrected.

In Graphing window:
- Fixed dynamic updates to work properly even under heavy bus loads

In frame playback:
- Fixed a bug where single stepping through frames didn't send them over canbus

deltamodel.cpp

@@ -0,0 +1,36 @@
+#include "deltamodel.h"
+
+DeltaModel::DeltaModel(QObject *parent)
+    : QAbstractTableModel(parent)
+{
+}
+
+QVariant DeltaModel::headerData(int section, Qt::Orientation orientation, int role) const
+{
+    // FIXME: Implement me!
+}
+
+int DeltaModel::rowCount(const QModelIndex &parent) const
+{
+    if (!parent.isValid())
+        return 0;
+
+    // FIXME: Implement me!
+}
+
+int DeltaModel::columnCount(const QModelIndex &parent) const
+{
+    if (!parent.isValid())
+        return 0;
+
+    // FIXME: Implement me!
+}
+
+QVariant DeltaModel::data(const QModelIndex &index, int role) const
+{
+    if (!index.isValid())
+        return QVariant();
+
+    // FIXME: Implement me!
+    return QVariant();
+}