Closes feature request #25 -- multiple dialogs #26
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This closes feature request #25 -- multiple dialogs when canceling a copy. I
rearranged things so that the code in MainWindow is much cleaner; there are no
more copyThis() methods. Instead I drove all the complexity into BtTreeView
and BtTreeModel, like deleteSelected.
This does somewhat change the syntax of the cancel button. To avoid copying a
single item, just enter an empty name. I added a tool type to explain this. I
also changed the "Cancel" button to read "Cancel All", hoping this will make
it more obvious.