[O] [PATCH] fix appointment warn time

[Ivan Kanis]

It seemed to be a boundary error. (point) was at the end of the
timestamp which doesn't hold the org-appt-warntime property.

foo.org illustrate what I have seen. Evaling the get-property sexp
returns nil.

The patch adds a function that goes at the beginning of the header to
get the property. As a bonus it turns the string into a number.

Please let me know if the patch is accepted or needs improvement.

warntime.diff
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foo.org
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