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# __construct()
 -  takes a name as its first argument
 -  removes the leading -- of the option name
 -  can take a shortcut as its second argument
 -  removes the leading - of the shortcut
 -  gives a  mode by default
 -  gives a  mode by default
 -  gives a  mode by default
 -  can take  as its mode
 -  can take  as its mode
 -  can take  as its mode
 -  can take  as its mode
 -  can take  as its mode
 -  can take  as its mode
 -  can take  as its mode
 -  can take  as its mode
 -  can take  as its mode
 -  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 option can be an array
 -  returns true if the option can be an array
 -  returns false if the option can not be an array
# ->getHelp()
 -  returns the help message
# ->getDefault()
 -  returns the default value
 -  returns the default value
 -  returns null if no default value is configured
 -  returns an empty array if option is an array
 -  returns false if the option does not take a parameter
# ->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 PARAMETER_NONE option
 -  throws an sfCommandException if you give a default value which is not an array for a IS_ARRAY option
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