Global Validation of Linear Models Assumptions

Methods from the paper: Pena, EA and Slate, EH, "Global Validation of Linear Model Assumptions," J. American Statistical Association, 101(473):341-354, 2006.

Things I'd like to revise:
1.  passing of alphalevel around
2.  repetitive computing of outlying observations in display.delstats,
	summary.gvlmaDel