Changes to normalizer:
- covariates are now always orthogonalized
- fix PCA adjustment when correcting for covariates
Allow ImputeToTriTyperConverter to convert specific set of SNPs
Remove probes with zero variance before normalizing
Merge branch 'master' of https://github.com/molgenis/systemsgenetics.git
Merge pull request #146 from harmjanwestra/master

Updates and fixes to various scripts