CLI: add -f option to allow overwriting
CLI: better Python
CLI: handle `FileExists` exception for multifetch
CLI: order options alphabetically
CLI: order commands logically
Qt: "show" -> "emission"
Qt: add emission infos frame UI
Make a copy of the QModelIndex received in itemExpanded

Signed-off-by: Simon Marchi <simon.marchi@polymtl.ca>