unfiltering the inventory plot (feature request)

[mbmcgarry]

In cyclist, the Inventory Plot has a dropdown menu that allows the user to filter on a specific nuclide or family of nuclides. However, once a filter has been applied, there does not appear to be a way to un-do it and revert back to the total inventory for the facility. Please add a category to the dropdown box such as 'Total', which should continue to be the default.