Updated .gitignore.
Enforce non-constant columns as a precondition for slycat.cca().
More .gitignore modifications.
Remove obsolete analysis server code.
Repo organization.
Adding regression tests for new slycat.cca.cca() behavior.
Don't allow users to select constant columns as inputs / outputs.
Merge branch 'cca-rank'
Merge branch 'ui'
Updating CCA notebooks.
Merge branch 'master' into ui