Add link from CTDIvol histograms to associated data

[David Platten]

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[David Platten]

Added a hidden filter for max and min acquisition CTDIvol. I should be able to use this to create links from CTDIvol histograms to the associated data. References issue #224. As an aside, I think it may be worth letting the user choose which filters are hidden. I think this should be fairly straight-forward to do by adding some fields to the userprofile.

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[David Platten]

Added links to CTDIvol histograms that take the user to a list of studies that contain the data corresponding to that histogram bar. Fixes issue #224.

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[David Platten]

Deleted commented-out lines. References issue #224.

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