Split a dive by time

[Linus Torvalds]

On Sun, Jul 1, 2018 at 1:57 PM Linus Torvalds
<torvalds at linux-foundation.org> wrote:
>
> Fixing that, I get the right splits, and let me just fix the merging too.

Ok, fixed that too, and now I can take Alberto's dive, and do "split
selected dive" on it to get the four non-surface parts, and then
stitch the three quick dips that were part of the rescue dive back
into one dive, ending up with two dives.

If somebody wants to have a manual "split at this point" UI, that's
fine too, but these fixes for the automatic case do actually fix real
issues and make it possible to do this all using the existing UI.

Pull request done on github.

                 Linus

                  Linus