to be created if it's missing, otherwise completely ignore it's modes and
owners. Primary intended targets: /usr/src and /usr/obj.
Adjust the 'not created: File exists' message to mention that it's a
directory that's the problem, otherwise it doesn't make sense.
I had created chown-style -L and -P flag to control logical/physical mode
(ie: whether symlinks were followed), but the nochange flag is enough to
get the blasted thing out of my hair so I took them back out.
2. Clean up code so it compiles -Wall (except for sccsid's and copyright).
This included fixing several printf formats that where not correct,
and changing the data types of a few things.
3. Implement new option -i that produces indented mtree output files.
4. Implement new option -n that turns off directory comments.
5. Only emit /set records if something has changed since the last one.
