stepwiseqtlF: fix problem with pheno.cols in case of missing phenotype data
stepwiseqtlF: restore previous change; fix apparent problem with pheno.cols[-1] vs pheno.cols[-2]
fitqtlF: wasn't treating pheno.cols correctly; need to drop individuals with missing data
Update version + date
Merge pull request #13 from kbroman/master

fitqtlF wasn't dealing with pheno.cols properly