FIX wxterm:  py-editor suggestions popup
FIX wxterm:  close all plots
FIX wxterm help:  don't rely on bool(topic)
FIX wxterm:  Copy matplotlib figures
FIX wxterm:  clean shutdown

- only call event.CanVeto() if method is present
- exit pdb if it is running
ENH wxterm:  quit properly
ENH wxterm editor:  status text

move filename in status text to the right so as to keep position visible even with long file names
STY wxterm:  relative imports