GenerateData: Make two samples from the diseased and healthy populations.
In blebedenko/thescript2: Boris's thesis scripts

Make two samples from the diseased and healthy populations.

GenerateData(
  distribution,
  n,
  AUC,
  theta_squared,
  var_eq = TRUE,
  ME_var_ratio = 1
)

`distribution`	One of the following strings : "normal", "gamma.skewed", "gamma.symmetrical", "log.normal","bimodal1","bimodal2" ,"t3" , "laplace"
`n`	an integer - sample size from each population
`AUC`	the probability P(X>Y) of correctly ranking a pair of random observations (diseased,healthy).
`theta_squared`	the contamination parameter, aka noise-to-signal ratio.
`var_eq`	if TRUE VX=VY, else VX=2VY (b=1,2 in Ben's notation)
`ME_var_ratio`	(default to 1) determines the ratio of diseased/healthy ME variance (a in Ben's notation)