Solution for multiple calendars

[niccokunzmann]

It would be nice to easily join multiple calendars into one.
The problem we face is that UIDs might be duplicated.

Thus, we will need to calculate different series for them.
Passing a list argument might be the easiest option.

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[niccokunzmann]

This might be handled with by a reference to https://github.com/mergecal/python-mergecal

[niccokunzmann]

UIDs duplicated should not be an issue. Just adding an add(a_calendar) method should be it.