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# __construct()
 -  creates a new sfCommandOptionSet object
 -  takes an array of sfCommandOption objects as its first argument
# ->setOptions()
 -  sets the array of sfCommandOption objects
 -  clears all sfCommandOption objects
 -  clears all sfCommandOption objects
# ->addOptions()
 -  adds an array of sfCommandOption objects
 -  does not clear existing sfCommandOption objects
# ->addOption()
 -  adds a sfCommandOption object
 -  adds a sfCommandOption object
 -  throws a sfCommandException if the another option is already registered with the same name
 -  throws a sfCommandException if the another option is already registered with the same shortcut
# ->getOption()
 -  returns a sfCommandOption by its name
 -  throws an exception if the option name does not exist
# ->hasOption()
 -  returns true if a sfCommandOption exists for the given name
 -  returns false if a sfCommandOption exists for the given name
# ->hasShortcut()
 -  returns true if a sfCommandOption exists for the given shortcut
 -  returns false if a sfCommandOption exists for the given shortcut
# ->getOptionForShortcut()
 -  returns a sfCommandOption by its shortcut
 -  throws an exception if the shortcut does not exist
# ->getDefaults()
 -  returns the default values for all options
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