gene expression data

Function returns a named vector with scores [-1,1]. Names are genes. Values are scores that indicate whether a gene is DE based on FC and z criteria.

1 2	E3GetDEScores(sampledata, sampleA, refsamples, scorefun = E3DEscore, rankrescale = TRUE, shiftval = 0.1)

`sampledata`	- list with expression, expression.low, expression.high tables
`sampleA`	- character string. The sample for which the signature is made
`refsamples`	- character vector. Reference samples to which sampleA is compared.
`scorefun`	- function. This function should accept two arguments (fc and z) and return a numeric score.
`rankrescale`	- logical. Set TRUE to penalize scores in an ad-hoc way for genes that have a high score but lower fc or lower z than many other genes.
`shiftval`	- numeric. Used when computing FC to avoid division by zero. return - a vector with gene names and then a score [0,1] Score 1 means the gene is DE wrt all samples in groupB