Fix handling reinstallation flow of packages and headless packages
Fix handling reinstallation flow of packages and headless packages

Conflicts:
	plugins/c9.ide.installer/gui.js

c9/c9.ide.installer,GHackAnonymous/c9.ide.installer,c9/c9.ide.installer,GHackAnonymous/c9.ide.installer,c9/c9.ide.installer,GHackAnonymous/c9.ide.installer