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# __construct()
 -  takes a name as its first argument
 -  gives a  mode by default
 -  can take  as its mode
 -  can take  as its mode
 -  can take  as its mode
 -  throws an sfCommandException if the mode is not valid
# ->isArray()
 -  returns true if the argument can be an array
 -  returns true if the argument can be an array
 -  returns false if the argument can not be an array
# ->getHelp()
 -  return the message help
# ->getDefault()
 -  return the default value
# ->setDefault()
 -  can reset the default value by passing null
 -  changes the default value
 -  changes the default value
 -  throws an sfCommandException if you give a default value for a required argument
 -  throws an sfCommandException if you give a default value which is not an array for a IS_ARRAY option
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