One liner. Add a slash to prevent dir being interpreted as a file.

Add a slash to prevent dir being interpreted as a file.

I think I read somewhere that F3's policy is that dirs are only dirs when there is a slash on the end. But This does not hold here, because the dir in question is already being interpreted/allowed as a dir without question. 

The consequences of this bug was that 1. \DB\Jig\drop() was broken if the user does not put a slash on the end. 2. files are created instead of dirs.