Positive, double and triple checked it. It's gone.

If only I new what's the name of the package, I would have tried to reinstall it. I recently tried to uninstall the 'alarmed' app but confused names and fired 'apt-get remove alarmd' without an 'e' between 'm' and 'd' which caused the whole calendar app removed. Rolling it back did help and the calendar app works again, but the widget is gone...