Documenting and improving plotting

[smishr]

See section 7.4 from Lohr - Sampling Design and Analysis for many surveys specific enhancements for plotting.

Check functionality that various plots work as expected. Key thing is that weighting is incorporated appropriately. Then document them in Manual with a walkthrough and illustrative examples.

Also how should weighted plotting work with ReplicateDesign? Using the mean of the simulated weights or one realisation of them?

• [ ] Histograms
• [ ] Boxplots, side by side boxplots
• [ ] Density estimators
• [ ] Bivariate plots - check weighting incorporated
• [ ] Weighted scatter plots
• [ ] Smoothing functions, trend lines
• [ ] estimated CDF and PDF plots