Merge remote branch 'overlays-gentoo-org/master' into prefix

Merge remote branch 'overlays-gentoo-org/master' into prefix

This commit breaks Prefix completely.

It is just a merge of the changes made in master which are wrong
regarding Prefix.  As a result, the code here is now incorrect with lots
of double prefixes.

I hope I can fix the problems after this commit without missing a spot
so I won't break Prefix Portage.

Conflicts:
	bin/ebuild-helpers/dobin
	bin/ebuild-helpers/doconfd
	bin/ebuild-helpers/dodir
	bin/ebuild-helpers/dodoc
	bin/ebuild-helpers/doenvd
	bin/ebuild-helpers/doexe
	bin/ebuild-helpers/doinfo
	bin/ebuild-helpers/doinitd
	bin/ebuild-helpers/doins
	bin/ebuild-helpers/dolib
	bin/ebuild-helpers/doman
	bin/ebuild-helpers/domo
	bin/ebuild-helpers/dosbin
	bin/ebuild-helpers/dosym
	bin/ebuild-helpers/ecompress
	bin/ebuild-helpers/ecompressdir
	bin/ebuild-helpers/fowners
	bin/ebuild-helpers/fperms
	bin/ebuild-helpers/newbin
	bin/ebuild-helpers/newconfd
	bin/ebuild-helpers/newdoc
	bin/ebuild-helpers/newenvd
	bin/ebuild-helpers/newexe
	bin/ebuild-helpers/newinitd
	bin/ebuild-helpers/newins
	bin/ebuild-helpers/newlib.a
	bin/ebuild-helpers/newlib.so
	bin/ebuild-helpers/newman
	bin/ebuild-helpers/newsbin
	bin/misc-functions.sh
	pym/_emerge/Binpkg.py
	pym/_emerge/actions.py
	pym/portage/dbapi/vartree.py
	pym/portage/package/ebuild/config.py
	pym/portage/package/ebuild/doebuild.py