Why doesn't optparse.OptionParser.error() print the
list of correct options along with the error message
and usage?  This is what the user needs to know
whenever there's an error.  One can override this in a
subclass, but it's frustrating to have to do it every
time.  

To do this, change the first line in
OptionParser.error() from:

    self.print_usage(sys.stderr)

to:

    self.print_help(sys.stderr)
    print >>sys.stderr

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Because very few conventional Unix programs act this way:

$  -z
ls: invalid option -- z
Try `ls --help' for more information.
$ tar -a
tar: invalid option -- a
Try `tar --help' for more information.
$ cp -z
cp: invalid option -- z
Try `cp --help' for more information.

Note the pattern.  (Hmmm: perhaps Optik should throw in a
"try --help" if there's a help option in the current parser.)