Improve, update, and fix inference output

[tmelliott]

• Begin reformatting inference output for differenes
• fine tuning output
• fix tests, small changes to inference output (estimate|lower|upper)
• inference output for survey anova incl CIs and p-values
• Change inference one-way table to display single table (skip CI)
• Use correct method to estimate CIs for prop diffs in survey
• Update tests to handle new output
• handle bootstrap output for one-way table inference
• inference changes for survey tables; fix variable flipping