Bin/Src checkboxes in setup.exe

[Joshua Daniel Franklin]

I have been messing with setup.exe's chooser documenting it this
morning and it hit me that a lot space is being used up with the
Bin and Src checkboxes. As far as I can tell the only reason for
them right now is the ability to install both Bin and Src at the
same time or just Src if the Bin is not already present.

What are some thoughts on moving that functionality into the 
VerNum/Keep/Skip/Reinstall/Uninstall/Source toggle?