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When using the "callback" action, optparse requires 
that you STILL specify a "dest" parameter, though it is 
not required or used by the option parser. 
In fact, if you do not include the "dest" parameter, your 
options will still work properly, but optparse will 
generate an exception when calling the "--help" option. 
Not specifying a "dest" parameter will result in the 
following Exception when using the default "--help" or "-
h" option:
File "c:\Python23\lib\optparse.py", line 229, in 
format_option_strings
 metavar = option.metavar or option.dest.upper()
AttributeError: 'NoneType' object has no attribute 'upper'
<workaround>
by simply adding a bogus bug, the --help / -h option 
works properly even though the dest isn't actually used.
</workaround>