Check that the DisplayImpl provides _show() #111
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In particular, this means that setDefaultBackend("ds9") will succeed iff
display_ds9 is setup.
N.b. lsst.afw.display.ds9 provides a DisplayImpl that throws when created,
but this allows us to check for a valid display without instantiating it.
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In particular, this means that setDefaultBackend("ds9") will succeed iff
display_ds9 is setup.
N.b. lsst.afw.display.ds9 provides a DisplayImpl that throws when created,
but this allows us to check for a valid display without instantiating it.