man pages: let meson pick the output name
man pages: fix build dependency issues
man pages: remove authorship section
chown, cksum: add man pages
chmod: improve man page
chmod: set default "who" values
chmod: fix error with clearing suid mask
Initial pass on documentation
chgrp: fix usage string
nice: add note clarifying XSI support
link, unlink: normalize usage strings
unlink: move to XSI group
Update README.md
Update README.md

Clarify that some tools will abort under unspecified conditions
test/chmod: make executable
Implement comm
chown&chgrp: correct usage output
chmod: add conformance test
chmod wip test
unlink: add conformance test