AIC: AIC/Deviance calculation
In HAP.ROR: Recursive Organizer (ROR)

function for AIC/Deviance calculation given index of deleted SNPs

1	AIC(case.sub, ctl.sub, lib.sub, lib.sub.names, deleted.snps, ref = "NA")

`case.sub`	case subjects, two columns for two haplotypes
`ctl.sub`	control subjects, two columns for two haplotypes
`lib.sub`	the alleles library contains allele sequences for those only appear in the case and control samples
`lib.sub.names`	the corresponding names of the alleles
`deleted.snps`	a vector of positions of deleted SNPs
`ref`	allele names for the reference level, the default reference level (ref="NA") is the most common allelels

`logLK`	log-likelihood
`AIC`	AIC
`res`	the result object return from GLM
`dev`	deviance
`df`	degree of freedom
`dev.null`	deviance for null model
`df.null`	degree of freedom for null model