complete comments of functions in interpolation method

gui/doc/allclasses-frame.html

gui/doc/allclasses-noframe.html

gui/doc/com/toedter/calendar/DateUtil.html

gui/doc/com/toedter/calendar/IDateEditor.html

gui/doc/com/toedter/calendar/IDateEvaluator.html

gui/doc/com/toedter/calendar/JCalendar.html

gui/doc/com/toedter/calendar/JCalendarBeanInfo.html

gui/doc/com/toedter/calendar/JDateChooser.html

gui/doc/com/toedter/calendar/JDateChooserBeanInfo.html

gui/doc/com/toedter/calendar/JDateChooserCellEditor.html

...doc/com/toedter/calendar/JDayChooser.DecoratorButton.html

gui/doc/com/toedter/calendar/JDayChooser.html

gui/doc/com/toedter/calendar/JDayChooserBeanInfo.html

gui/doc/com/toedter/calendar/JMonthChooser.html

gui/doc/com/toedter/calendar/JMonthChooserBeanInfo.html

gui/doc/com/toedter/calendar/JSpinnerDateEditor.html

gui/doc/com/toedter/calendar/JTextFieldDateEditor.html

gui/doc/com/toedter/calendar/JYearChooser.html

gui/doc/com/toedter/calendar/JYearChooserBeanInfo.html

gui/doc/com/toedter/calendar/MinMaxDateEvaluator.html