ENH: Replaced GridLayout in qtDiagram
On some systems the layout was not allowing the contents to fully utilize the space available. The widget now uses 2 layouts - a VBox for the toolbar (if needed) and a HBox for the drawer and diagram itself.
On some systems the layout was not allowing the contents to fully utilize the space available. The widget now uses 2 layouts - a VBox for the toolbar (if needed) and a HBox for the drawer and diagram itself.