master
- use fmt_scaled(3) instead of home grown function to print -h numbers - do not use a linear list to keep track of inodes with link count > 2, use a red & black tree. Based on freebsd code that uses auto-sizing hash maps; this tree version by canacar@.
remove history of when each du(1) flag was added ok jmc@ schwarze@
userspace: remove vestigial '?' cases from top-level getopt(3) loops