Add section to the User Guide abour working with datetime columns in H2OFrames

Description

We don't a place that shows how to work with date columns in H2OFrames. Let's add a "Dates and Time" page to Data Manipulation.

Here's some examples that use date types – they extract things like day of week, etc, into new columns. We should have an example for every datetime utility function that we have in H2O.

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Assignee

Angela Bartz

Reporter

Erin LeDell