b99bb3d4bb
gnome-shell-build-setup.sh is generally useful for working on GNOME. If moving on from hacking on gnome-shell to some other module, having the checkout location be ~/gnome-shell is a little odd and cumbersome, so start out checking things out into ~/gnome/source and installing them into ~/gnome/install. Add a warning if the old ~/gnome-shell exists to avoid unnecessary checking out of every module again. https://bugzilla.gnome.org/show_bug.cgi?id=685355