744 - Projectors w/data arg takes 1st datum - area/line 

Close #744.
i don't like the naming of this function, can we switch it to `modifyAttrToProjectorToUseFirstDatum` or something like that?

calling it `project` is kind of misleading because one might think its a varient of the project call, really this is a modifier to `generateAttrToProjector`