Someone had 6000 images in their dataset, and it was shown as 0, which was confusing.
This will allow tracking real time dataset-average loss for registered objects.

added an option to always only show one image in previews
removed duplicate code

[Hypernetworks] Add a feature to use dropout / more activation functions

Implementation of CUDA device id selection (--device-id 0/1/2)

generalized some functions and option for ignoring first layer

added support for extensions