CommentStreams:Beedab519daa468403a0488accfb39ee

I don't think it's very clear from the intro what the `/usr` merge is.

I think some info that boils down to: `/bin → /usr/bin /sbin → /usr/sbin /lib → /usr/lib /lib64 → /usr/lib64`

Would greatly clarify what's going on here and what the script is doing.