Add a widget displaying a stack of images

[picca]

Hello, it would be great if guiqwt could provide a generic widget which allow to display a stack of images. A sort of StackImagePlot. This widget could take a StackImage class object which could be subclassed by the user in order to let's the user decide how to grab the image from a file, a camera, and hdf5 file etc...

I imagine that some tools could be attached to each images in order for exemple to select some point depending on the images, etc...