[O] Incorrect sum of times in table

[Paul Stansell]

Hello,

I noticed a case where the sum of two times in a table does not give
the correct answer.

To see this, create an org file with the following lines:

| 0:00:31 |
| 0:00:30 |
|---------|
|         |

Open it and type C-+ C-y in the empty cell of the table.  The answer
inserted is 0:01:00 instead of 0:01:01.

Regards,

Paul

PS. I'm using Emacs 24.2.1 and Org-mode release_8.0.3-331-gf7e6f1 and
I tested with the minimal org-mode set-up from
http://orgmode.org/manual/Feedback.html.