Fingerprint analysis tool

[andrew_peterson]

It currently lives in descriptor/analysis.

1. Add documentation to the website so we know it is there.

2. Add the ability to add an image over it. The idea is that first you would run this with the training images which it plots as violins. Then you can add a new image (or an atom of a new image) and have it added as dots; this should make it apparent if there are outliers.

3. Add a test.

[andrew_peterson]

Done in commit 1e72a1c