[3.1.4 modification] modify calendar library, add extra column before calendar

I've done a lot of work extending the calendar class. Yes, you will create a MY_calendar.php. You will spend quite a bit of time learning what's going on in the calendar class so that you can make your modifications.

Also, I ended up needing to extend the calendar class in two different ways, and so you should think about the modifications you are making, and remember that there may be a time when you don't want those specific mods to affect the calendar.

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