Reduce noise in dependency declaration during uninstall in setup.exe

[Warren Young]

Alternate idea:

If all of the changes requested on the previous screen are "Uninstall" 
(i.e. everything else is "Keep" or "Skip"), invert the current 
dependency tree walking logic.  That is, have setup.exe find out which 
packages must be removed to satisfy the changes requested on the 
previous screen.

"Look, buddy, if you remove that package, I gotta remove these 84 other 
packages, too: {foo, bar, baz...}  Are you really really sure you want 
me to do that?"

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