Hide internal functions

[maurolepore]

Do you don't need to @export all these functions? If some functions are internal the code becomes more flexible because it's easier to change internal functions than exported ones. Also we can save some time because internal functions don't need very deep documentation.

[maurolepore]

I kind of did this. I have already removed the @export tag from all but the main function. If we later notice that we need to export more functions, then we can do it. It is always better to export less than more.