Version 4.5.9

* Fixed weird bug in Model Editor when averaging two dots and replacing one with the result causes the old dot data to be retained.
* Rearranged the menus in the Model Editor to reduce the depth of the menu tree.
* Added "Translate Frame, Rotate Frame and Scale Frame + Mirror Frame Vertical and Mirror Frame Horizontal" commands to menus for orthogonal neatness reasons.
* Added stub code for these tools. TODO.
* Changed the "Average Two Dots to New Dot" dialog to be multi-use rather than single use.
* Changed the "Translate Dot" dialog to the multi-use rather than single use and update display accordingly.