Automatically unwrap MPtr Julia "objects" ?

[fingolfin]

I wrote a Julia function which just returns its first argument, and put it into GAP variable myfunc. Now I get this:

gap> myfunc(fail, 2);
<Julia: Main.ForeignGAP.MPtr()>

It would be very convenient (and should be super cheap!) to instead return a this "MPtr" object as a regular GAP object. I.e., so that I'd get:

gap> myfunc(fail, 2);
fail

[sebasguts]

Indeed, I will do this. Now with the integrated gc, this is sensible.

[sebasguts]

Done with #43