[gnome-base/gdm] add sys-apps/lsb-release dependency
[sys-apps/baselayout] provide our version of /etc/os-release
[app-misc/sabayon-version] version bump to 11
[sys-apps/lsb-release] provide our own version of lsb-release, reading /etc/sabayon-release directly
[x11-misc/lightdm] provide sane split ebuilds for lightdm
[gnome-extra/nautilus-file-roller,app-arch/file-roller] v. bump to 3.6.3