Add regression tests to verify that the partial correlations feature still works as expected.
- [-] Tests for "entry-point" page - [x] Tests for partial correlation using Pearson's R against select traits - [ ] Tests for partial correlation using Spearman's Rho against select traits - [ ] Tests for partial correlation using Pearson's R against an entire dataset - [ ] Tests for partial correlation using Spearman's Rho against an entire dataset