Allow other user_edit_access overwrites

This module overwrite user_edit_access() by using hook_menu_alter() to make sure that the user profile for user 1 is not available to any other user. This calls userone_edit_access() instead which itself calls user_edit_access() again which is totally ignoring other hooks that probably had overwritten that callback before.

Userone should remember if that callback had been overwritten before userone overwrites it and then call that one instead of the default one if needed.

I will provide a patch in a minute.