RF: adding an helpers function to check if ground truth directions are in the write format. Before this, code was repeated in each type of simulations, thus now the codes are much more easy to read. This helper function will be tested on test modules
RF: adding an helpers function to check if ground truth directions are in the write format. Before this, code was repeated in each type of simulations, thus now the codes are much more easy to read. This helper function will be tested on test modules

jyeatman/dipy,oesteban/dipy,villalonreina/dipy,oesteban/dipy,StongeEtienne/dipy,JohnGriffiths/dipy,matthieudumont/dipy,demianw/dipy,jyeatman/dipy,matthieudumont/dipy,FrancoisRheaultUS/dipy,StongeEtienne/dipy,FrancoisRheaultUS/dipy,villalonreina/dipy,nilgoyyou/dipy,sinkpoint/dipy,demianw/dipy,rfdougherty/dipy,sinkpoint/dipy,rfdougherty/dipy,nilgoyyou/dipy,JohnGriffiths/dipy