This checks if the source objects for all Clones and Cross References type symbols exist and lists those where it does not.

Note when deleting objects that are refered to by a SetState in the model there is now a warning and you can cancel the deletion.

If you do delete them the clone tagname is not completely wiped out, !Ref not found! is appended instead. This is truncated if needed to a total length of 32ch.

Backup on close is now disabled if the model is open elsewhere, eg in the reviewer.

In Complete Update, after updating a button appears, Rename as Original, which will rename the old file as oldname.cndOld and the Updated file with the origiinal name