[Orgmode] Patch to add schedule propagation to org-depend

[Andrew Hyatt]

I like to schedule items I'm supposed to be working on, so I like when
I complete a task that the next sibling task gets the schedule from
the previous one.  This implements that kind of workflow with the
org-depend contrib package.

I've also added a few methods to org.el to make working with schedules
& deadlines easier.

org-depend-scheduled.patch
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