[O] Remove current heading from refile targets?

[Jason Dunsmore]

I noticed that when I go to refile a heading, the heading that I'm
refiling is listed in the refile targets.  If I choose to refile the
heading to itself, the following error is displayed:

org-refile: Cannot refile to position inside the tree or region

When I'm choosing a refile target, the current heading gets in the way.
Would it make sense to remove the current heading from the refile
targets?  I have org-completion-use-ido set to `t', so I'm using the ido
interface to refile.

Regards,
Jason