Removed a number of calls to wx.PySimpleApp().
This corresponds to one component of the patch_II file attached to https://gna.org/task/?6847 by Michael Bieri (https://gna.org/users/michaelbieri).
I'm guessing these were not necessary?
Authored by: bugman 2010-01-15
Parent: [r10235]
Child: [r10237]
