Add unit tests to 85% coverage

[MialLewis]

The vesuvio code is currently not covered by unit tests.

Unit tests must be added, satisfying the following tasks:

• vesuvio_analysis/core_functions/analysis_functions Add unit tests to analysis_functions #9
• vesuvio_analysis/core_functions/bootstrap Add unit test to bootstrap modules #10
  vesuvio_analysis/core_functions/bootstrap_analysis
• vesuvio_analysis/core_functions/fit_in_y_space Add unit tests to fit_in_y_space #11
• vesuvio_analysis/core_functions/ICHelpers Add unit tests to misc modules #12
  vesuvio_analysis/core_functions/procedures
vesuvio_analysis/core_functions/run_script
• Re-enable coverage requirements Re-enable Coverage requirements #13