IVE: Ask user if files should be deleted
When doing a delete of a function or undoing an import, ask the user if the corresponding files should be deleted or kept.
The .asn files should be kept even if the user says to delete the files.
In case of a redo, the files might be there already there (from a previous undo for example).
Then ask the user if the existing files should be overwritten.
Edited by Guenter Schwann