- put `usage' at the start of each message
- put a space between the option and arg in [-x foo]
* fix command parsing for when a two word command is invoked without
args or with an invalid second arg so that a more appropriate error
message is printed.
groupadd/groupmod/groupdel functionality, along with two front-end
utilities, user(8) and group(8).
Based on the addnerd package, but most of the interface has been
completely rewritten, and suggestions from simonb and mrg have been
incorporated.