add more residuals plots to autoplot() and plot()

[eeholmes]

Add to the "residuals" list of standard plots too.

Fitted

• [ ] show raw innovations residuals versus fitted
• [ ] show raw smoothation residuals versus fitted

Marginal residuals

• [ ] show marginal std innovations residuals versus time
• [ ] show marginal std innovations residuals versus fitted
• [ ] show marginal std smoothation residuals versus time
• [ ] show marginal std smoothation residuals versus fitted