Scene reproduction

[kitchoi]

This is for "batch processing" visualisation.

The idea is to pickle to a file the pipeline under each data source in a particular scene. For example, say the user has created a complicated scene with 3 datasets, applied some filters and modules, set the camera etc. The setup would be saved like this:

save_scene_setup("some_filename")

But the datasets are not saved.

Later the user wants to reproduce the same complicated scene with the same 3 datasets or 3 similar datasets. Then the user should add those datasets to the scene in the same order as before, and then do this:

reproduce_scene_setup("some_filename")

@dpinte, @itziakos Comments?

Not ready to merge yet

[kitchoi]

Need more investigation Relevant: #136, #132, #134, #140