Merge pull request #354 from harmjanwestra/master

Fix for effect Z-score direction
removed duplicated printing of the number of samples
Merge pull request #355 from DashaZhernakova/master

Interaction analysis: removed duplicated printing of the number of samples
Bug fix convertBetaToP
Merge pull request #356 from PatrickDeelen/master

Bug fix convertBetaToP
Another small bugfix for very low p-values.