Update subject specific plot

[gurayerus]

Current plot is a fake one that shows only a set of ROIs. Create a page with options to plot imaging variables in a more informative way. This can include:

• Plot of a large number of ROIs
• Specific panels for ML variables (e.g. SPARE panel, SurrealGAN panel)
• Normalize the values: convert them to subject specific centile values (e.g. detect where a specific value for a subject falls in comparison to centile values for the same age/sex group)

[gurayerus]

Subject specific viewer is not part of current release. It will be added after it's updated in a way that will provide more complete functionality