Issue [#2113513]: Users may now exclude the DTSTAMP field from their feeds.
Some ical feed readers will erroneously take the DTSTAMP field into consideration when comparing a new download to a previous one, and end up treating all events as having been updated, because their DTSTAMP field is different. This new option lets you get around those buggy readers. I also added the CREATED field, which was embarassingly missing until now.
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