Remove unnecessary hack

The issue this code solved was that setting the proxy icon via represented file before a file actually exists on disk would lead to no icon so we would have to update it again after a successful save.

This however is already done (by the save callback passed in).
Save All with more than one document would crash
Suppress atos debug output
Make openItems:closingOtherTabs: more robust
Cap document array index
fixup! Iterate controllers instead of all window delegates
Checkin release notes