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# __construct()
 -  creates a new sfCommandArgumentSet object
 -  takes an array of sfCommandArgument objects as its first argument
# ->setArguments()
 -  sets the array of sfCommandArgument objects
 -  clears all sfCommandArgument objects
# ->addArguments()
 -  adds an array of sfCommandArgument objects
 -  does not clear existing sfCommandArgument objects
# ->addArgument()
 -  adds a sfCommandArgument object
 -  adds a sfCommandArgument object
 -  throws a sfCommandException if another argument is already registered with the same name
 -  throws a sfCommandException if there is an array parameter already registered
 -  throws an exception if you try to add a required argument after an optional one
# ->getArgument()
 -  returns a sfCommandArgument by its name
 -  throws an exception if the Argument name does not exist
# ->hasArgument()
 -  returns true if a sfCommandArgument exists for the given name
 -  returns false if a sfCommandArgument exists for the given name
# ->getArgumentRequiredCount()
 -  returns the number of required arguments
 -  returns the number of required arguments
# ->getArgumentCount()
 -  returns the number of arguments
 -  returns the number of arguments
# ->getDefaults()
 -  return the default values for each argument
 -  return the default values for each argument
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