[#571] exclude collection "/" from subcollections

[d-w-moore]

The iRODSCollection object has a property known as subcollections which, by any reasonable standards (including at least one aimed at preventing infinite loops in collection iteration) should not include any collections pointing at the same path as (ie equivalent to) the parent collection object.

The ultimate takeaway - "/" by definition shouldn't be counted within the subcollections of any collection object.

[trel]

looks good to me.

[d-w-moore]

Now #'d