RRULE import works now!
I hadn't yet tested the RRULE import code when I first pushed Date iCal 3.x-dev, but now I have. It's much more robust than it was in 2.x. In addition, I moved the parsing class out of DateiCalFeedsParser.inc and into libaries/ParserVcalendar.inc, which is like how Feeds' own CSV parser is set up.
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