Add help completion. Allow subcommand to be run standalone
Allow frame number values to come out in the order they were given.
Thanks go to Bart Schaefer for showing the way.
processor.sh: Add last command to history unless it was empty or there was an error
show.sh help.sh: Remove more vestages of the older help system
lib/complete.sh: comment how completion works
Merge branch 'master' of github.com:rocky/zshdb

Conflicts:
	ChangeLog
	lib/help.sh