Add ofGetDataPathRoot

[pierrep]

We have ofSetDataPathRoot() .... it makes sense to have a Getter as well. Basically I wanted the absolute path to the root data folder.

I managed to fake this by calling ofToDataPath(".",true) but this seems a little counter-intuitive.

[DomAmato]

I think this should work should it not:

string ofGetDataPathRoot() {
    return dataPathRoot().string;
}

[ofTheo]

I would be in favor of ofGetDataPathRoot
maybe with a non hidden absolute argument?

string ofGetDataPathRoot( bool bAbsolute );

[DomAmato]

I'll take a look since the code i posted above obviously only gives the absolute path, shouldnt be too difficult