Unsupervised: Updated documentation

[ajdapretnar]

Updated documentation for:

• Distance File
• Correlations
• Distance Map (low-high to range)
• Hierarchical Clustering
• Manifold Learning (minor)
• PCA (minor)
• Neighbors (minor)
• Distances
• MDS
• Save Distance Matrix

Workflows added for reproducibility.
Final commit cleans up documentation a bit.